Atomic Structure and Average Atomic Mass

How many protons does an aluminum atom have?

• 27

• 14

• 40

• 13

How many electrons does a sodium atom have?

• 23

• 11

• 12

• 34

Tags

NGSS.MS-PS1-1

Complete the missing label on the diagram.

• Neutron

• Centre

• Nucleus

• Sub atomic particle

Tags

NGSS.MS-PS1-1

Atoms of the same element must always have the same number of _________

• electrons

• neutrons

• isotopes

• protons

The _________ of an element equals the number of protons in an atom of that element.

• mass number

• atomic weight

• atomic number

• isotopes

What element has 9 protons, 9 electrons, and 10 neutrons?

• nitrogen

• oxygen

• fluorine

• neon

Tags

NGSS.MS-PS1-1

What is the correct number of subatomic particles of a phosphorous atom with a mass of 31?

• p# - 15, n# = 15, e# = 15

• p# - 15, n# = 16, e# = 15

• p# - 15, n# = 15, e# = 16

• p# - 16, n# = 15, e# = 15

What does the 6 represent?

• Atomic mass

• atomic number

• chemical symbol

• element name

How many electrons does this atom have?

• 2

• 4

• 6

• 10

Tags

NGSS.MS-PS1-1

How many total electrons does Mg⁺² (a magnesium ion) have?

• 10

• 12

• 14

• 22

Tags

NGSS.MS-PS1-1