# What Element Has 9 Protons

What Element Has 9 Protons – 9 Why do we use AMU (Atomic Mass Unit) when we represent the mass of an atom? instead of grams or kilograms

10 atoms are very small. Using grams will produce a number using the scientific notation 10-27.

## What Element Has 9 Protons

AMU is a unit used specifically for atoms. which is much less than a gram So it is more useful.

#### New Element 117 Vies For A Seat At The (periodic) Table

13 Al Aluminum 26.98 Atomic number Number of protons = Number of electrons Atomic mass number (this is the average of isotopes) Mass # – Atom # = Neutron # When calculating # neutrons you must round mass # to a whole number…. You can’t have any neutrons!

11…..what can be concluded that there are 11 protons and 11 electrons 27…..concluded that there are 27 protons and 27 electrons 87….what can be concluded that there are 87 protons and 87 electrons

5…..what can you conclude that there are 5 protons 32…how can you conclude that there are 32 protons 11…how can you conclude that there are 11 protons

Element A has 12 protons, 13 neutrons and 12 electrons, element B has 9 protons, 7 neutrons and 9 electrons.

#### Standard Atomic Notation

Element A has 12 protons, 13 neutrons and 12 electrons, 12 protons + 13 neutrons = 25 masses, element B has 9 protons, 7 neutrons and 9 electrons, 9 protons + 7 neutrons = 16 masses.

19 Page 16 & 17 review What are the 3 elements in the periodic table? What are the characteristics of each? Where are they in the periodic table?

Shiny conducting ductile metalloids: along the ladder, properties of metals and non-metals. Semiconductors used in the computer industry Non-metals: Right side of the table Solid insulator Does not conduct heat or electricity Brittle

Group/family Group information: Group number = Number of valences Group e members are equal Find 4 similar elements Find 2 similar elements and 4 valence electrons

#### Atom Definition And Examples

Group/family information: Group number = number of valence electrons Group e members have similar properties Find 4 elements with similar properties Find 2 elements with similar properties and 4 valence electrons Carbon (C) Silicon (Si), Germanium (Ge), Tin ( Sn), lead (Pb)

Period data: number of periods = number of electrons with the highest energy level # electrons in each level (ring) period 1….2 e- period 2….8 e- period 3….8 e- find 3 elements with 4 electron energy levels Find 3 elements with two energy levels.

24 Describe these groups using the following terms: reactive, non-reactive, more stable, inert alkali metals halogen noble gases alkaline earth transition metals metals

Alkali metals…..reactive metals, group 1, +1 ions alkaline earth metals…..reactive metals, group 2, +2 ions metals/transition elements…. weakly reactive metals, placed in the middle of the table, group 3- 12 halogens…reactive nonmetals, used in cleaning agents, group 17, -1 ions noble gases….nonreactive metals, group 18, Very stable due to intact outer electron ring , no ions form

#### Solved Question 6 1 Point An Element Has 2 Neutrons, 2

1 reaction, non-reactive 2 reactions, weakly reactive, reactive, non-reactive 3-reactive, weakly reactive, reactive, 4-reactive, somewhat stable, weakly reactive, reactive, non-reactive

Metal donating electrons Non-metal accepting electrons Atoms donate/accept electrons to form a complete (valence) outer ring of electrons…this makes it stable since the electron configuration is the same as for noble gases (Group 18).

36 forms of isotopes of the same component Isotopes of an element have different numbers of neutrons, so they have different masses.

S-24 differs from S-20 in that it has more than 4 protons, more than 4 electrons, more than 4 neutrons, more than 2 neutrons, and 2 protons.

#### Atoms: What Are They And How Do They Build The Elements?

F E B C A Does not react with other elements Inert Industrial use It is found in its pure form in nature. Not very reactive 3 Electron energy levels Reaction with 2 valence electrons, 1 valence electron, 5 energy levels, non-metal reaction, 4 energy levels

F E B C A Does not react with other elements Inert (D) Industrial use It is found in its pure form in nature. Little reactive (C) 3 electron energy levels (F) reacts with 2 valence electrons (A) 1 metal valence electron and 5 energy levels (B) non-metal reacts with 4 energy levels (E )

To make this website available We store user data and share it with processors. to use this website You must accept our privacy policy. including cookie policy An atom’s charge is generated after it has given or received e-s, the number of protons, regardless of the first letter of its name. The first two letters of the name two letters from A name or letter from a Latin name. given by the person who discovered it Interactive Periodic Table Poster Mass of Protons + Mass of Neutrons Each proton and neutron has a mass of about 1 amu, or g/mol. Round each atomic mass to the nearest whole number # Neutrons = atomic mass – atomic number amu = atomic mass unit g/mol = mass of 1 mole of atoms. 1 mole = 6.02 x 1023 atoms

5 Atomic mass and number Atomic mass is the average mass of the atoms of an element. Each atom has a different mass that is unique to the element it belongs to. The atomic number is the number of protons in the nucleus of an element.

#### Nucleus Of An Element Has Nine Protons. Its Valency Would Be:

So for fluorine the atomic mass is that we take a mathematical rule and round up or down. Therefore, fluorine has an atomic mass of 19.

Fluorine 9 F Element Symbol Atomic number Atomic mass Fluorine has 9 protons and 9 electrons Fluorine has 19 (rounded up) – 9 = neutrons, i.e. 10 neutrons.

What is its atomic mass? What is the standard atomic notation for oxygen? How many protons does it have? electron? How many neutrons does it have?

To make this website available We store user data and share it with processors. to use this website You must accept our privacy policy. including cookie guidelines until now About 118 different elements have been discovered; By definition, each one is unique. To understand why they are unique. You need to understand the structure of the atom (basic, single particle of an element) and the properties of its constituent parts. Atoms consist of electrons, protons and neutrons. Although this is an oversimplification of ignoring the other discovered subatomic particles, it is enough to discuss the equality principle. Some properties of these subatomic particles are summarized in the table. (PageIndex), which shows three key points:

### Periodic Table With Charges

The discovery of electrons and protons was crucial to the development of modern atomic models. In fact, describing the structure of the atom is one of the greatest detective stories in the history of science.

An atom’s atomic space consists of free space that electrons occupy (form (PageIndex)) The very small mass of an electron (1/1840 of the mass of the hydrogen nucleus) makes the electron behave like a quantum particle. This means that its location cannot be determined at any time. The best we can do is to describe the behavior in terms of its probability of manifesting at any moment in space. This is normal. It is possible (but misleading) to describe the volume of space in which an atom’s electrons are likely to be found as a

The latter has no clear outer boundaries. So is the atom. The atomic radius must be determined arbitrarily, i.e. to what extent an electron can be found with 95% probability. The atomic radius is generally 30-300 pm.

Figure (PageIndex): Structure of a helium atom with a central nucleus surrounded by electrons (CC BY-SA 3.0; Yzmo via Wikipedia).

### How To Find The Number Of Protons, Neutrons, And Electrons

The number of protons in an atomic nucleus is its atomic number ((Z)). This is a defining property of an element: its value determines the atom’s identity. For example, any atom with six protons is carbon and has atomic number Z. 6 It does not matter how many neutrons or electrons an atom has. Neutral atoms must have an equal number of positive and negative charges. Therefore, the number of protons is equal to the number of electrons. Therefore, atomic number also indicates the number of electrons in an atom. The total number of protons and neutrons in an atom is called the mass number ((A))) The number of neutrons is therefore the difference between the mass number and the atomic number:

Elemental identity is given by (Z), which is the number of protons in the nucleus of the element’s atom. which will be different for each element The known elements are arranged in the order of increasing Z in the periodic table (figure (PageIndex)) The reason for the specific pattern of the periodic table will be explained later. Each element is assigned a unique symbol of one, two or three letters. Element names are listed in the periodic table. Along with the symbol, atomic number, and atomic mass, the chemistry of each element is determined by the number of protons and electrons.

Figure (PageIndex): Color-coded periodic table for atomic masses. Note the components on

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