Reading Element Key/Lewis Dot/Bohr Model

The number at the top of the element key is called the atomic number, what does it tell you?

• protons and electrons

• protons and neutrons

• neutrons and electrons

• protons only

The bottom number on the element key is the atomic mass, it tells us...?

• protons plus electrons

• protons plus neutrons

• electrons plus neutrons

• protons and electrons

Label the element key

a

b

c

d

atomic mass

element name

element symbol

atomic number

How many neutrons does Argon (Ar) have?

• 18

• 40

• 22

• 39

What are the vertical columns called and what do they tell me?

• periods and electron shells

• periods and valence electrons

• group number and electron shells

• group number and valence electrons

What are the horizontal rows called and what do they tell me?

• periods and valence electrons

• periods and electron shells

• groups and valence electrons

• groups and electron shells

How many energy levels or electron shells does Silicon (Si) have?

• 14

• 28

• 3

• 2

How many valence electrons does silicone have?

• 14

• 12

• 4

• 3

Tags

NGSS.MS-PS1-1

The first step in drawing a lewis dot diagram is to....

• write the chemical symbol

• write the element name

• figure out how many protons there are

• figure out how many electrons there are

The second step in drawing a lewis dot diagram?

• write the element symbol

• figure out how many valence electrons there are

• figure out how many protons there are

• figure out the number of energy levels