Protons and Valence Electrons

Poll

The only true way to identify an atom is by the number of protons.

• True

• False

​Protons are the only true way to identify an atom.

​

Electrons and neutrons can be different from the periodic table.

​

When protons change, it changes to the next element.​

Multiple Choice

How many protons does Bismuth have?

• 83

• 126

• 208.95

• 209

To Find:

​Protons---look at the atomic number

​

Neutrons--Mass # - atomic #

​

Electrons--same as protons--look at atomic #​

Match

Match the following

• nucleus

• electron cloud

• atomic number

protons and neutrons

electrons

protons

• protons and neutrons

• electrons

• protons

Match

Match the correct answer for the parts of Tungsten.

• 74

• 184

• 110

Protons

Mass number

Neutrons

• Protons

• Mass number

• Neutrons

Multiple Choice

When working with an atomic model, how do you find the mass number?

• Count the number of protons in nucleus

• Count the number of neutrons in nucleus

• Count the number of electrons in electron cloud

• Add the protons and neutrons in the nucleus

Match

Match the following

• protons

• neutrons

• electrons

• electron cloud

• nucleus

positive, found in nucleus

neutral, found in the nucleus

negative, found in the electron cloud

surrounds the nucleus, holds electrons

holds protons and neutrons, mass number

• positive, found in nucleus

• neutral, found in the nucleus

• negative, found in the electron cloud

• surrounds the nucleus, holds electrons

• holds protons and neutrons, mass number

​Remember:

Protons and electrons are the same #.

They are the same number---which makes the atoms neutral (no electrical charge)​​

If you can't find # of protons, look for electrons​

Match

Match the atomic model to the correct element name.

Boron

Lithium

Carbon

Silicon

• Boron

• Lithium

• Carbon

• Silicon

​What are valence electrons?

Valence electrons determine reactivity.​

They are found on the last energy level of an atom. Farthest from the nucleus.​

The group number, tells the number of valence electrons.

1A, 2A, 3A, 4A, etc. We want A's not B's.​

Reactive vs Non-reactive atoms

The # of valence electrons determines how reactive the atom is.​

8 valence electrons---non-reactive

less than 8 valence electrons--reactive​

​

Group 1 is the most reactive.

Group 18 is the least reactive.​

Multiple Choice

How many valence electrons does Sodium have?

• 11

• 23

• 12

• 1

Multiple Choice

How many valence electrons does Argon have?

• 18

• 8

• 40

• 22

Multiple Select

Choose all answers that are correct about Sulfur.

• It is a metal

• It has 16 protons and electrons

• It is a non-metal

• It is on the left side of the zig zag line

• It has 16 neutrons

Reorder

Reorder the following according to the number of protons. Put in order from least number of protons to greatest.

• Hydrogen

• Beryllium

• Carbon

• Neon

• Magnesium

1

2

3

4

5

• 1
• 2
• 3
• 4
• 5