Periodic Table and Bohr Models

How do you find the number of neutrons in an element?

• Add the proton and electrons

• Subtract the electrons from the protons

• Subtract the atomic number from the atomic mass

• Its the same as the number of protons

How do you find the number of electrons in an element?

• It's the same as the number of protons

• Subtract the atomic number from the atomic mass

• Add the protons and neutrons

• It's the same as the atomic mass

How many shells of electrons are there in a lithium atom?

• 6

• 7

• 3

• 2

Tags

NGSS.MS-PS1-1

How many protons are in a sulfur atom?

• 32

• 16

• 3

• 8

Answer explanation

The number of protons is the same as the atomic number.

Tags

NGSS.MS-PS1-1

How many neutrons are in a lithium atom?

• 3

• 4

• 6

• 7

Answer explanation

To find the number of neutrons, subtract the number of protons (atomic number) from the rounded atomic mass.

Tags

NGSS.MS-PS1-1

How many shells of electrons are in a gold atom?

• 6

• 79

• 197

• 118

Tags

NGSS.MS-PS1-1

How many electrons are in the outer shell of a sulfur atom?

• 2

• 8

• 6

• 16

Tags

NGSS.MS-PS1-1

On which row of the periodic table will you find sulfur?

• 2

• 3

• 8

• 6

On which row of the periodic table will you find gold?

• 79

• 6

• 2

• 8

Beryllium has an atomic number of 4 and an atomic mass of 9.012.

How many neutrons does it have?

• 4

• 5

• 9

• 13

Answer explanation

To find the number of neutrons, subtract the number of protons (atomic number) from the rounded atomic mass.