Atomic Counting

The top number on the periodic table is the ....

• atomic mass

• atomic number
• element symbol
• molecular weight

The bottom number on the periodic table is ...

• element symbol
• molecular weight
• atomic number
• atomic mass

The number of protons =

• The number of protons is equal to the number of neutrons.
• The number of protons is the mass of the element.

• The number of protons can vary r

• The atomic number of the element.

The number of electrons =

• The number of electrons is the element's mass number.

• The number of electrons is always equal to the number of neutrons

• the element's atomic number.

• can vary regardless of the atomic number.

The number of neutrons is worked out by ...

• Atomic number + Atomic mass number
• Atomic mass number - Neutron number
• Atomic number x Atomic mass number
• Atomic mass number - Atomic number

The number of electrons in a magnesium atom is ...

• 10
• 12
• 8
• 24

The number of protons in a magnesium atom is ...

• 10
• 12
• 8
• 24

The number of neutrons in a magnesium atom is ...

• 10
• 12
• 8
• 24

The sodium atom has how many protons?

• 10
• 12
• 11
• 14

The sodium atom has how many neutrons?

• 10
• 12
• 11
• 14