Atomic Number and Mass Number

Which term best matches the following definition?

Definition: the number of protons in the nucleus of an atom, which is characteristic of a chemical element and determines its place in the periodic table.

• Atomic Number

• Atomic Mass

• Net Charge

• Chemical Symbol

Which term best matches the following definition?

Definition: the mass of an atom of a chemical element expressed in atomic mass units. It is approximately equivalent to the number of protons and neutrons in the atom.

• Atomic Number

• Mass Number

• Net Charge

• Chemical Symbol

What is the number of protons in Magnesium atom ?

• 12

• 24

• 23

• 8

Tags

NGSS.MS-PS1-1

An element with a mass number of 11 and an atomic number of 5 has how many neutrons?

• 11

• 5

• 6

• 16

Tags

NGSS.MS-PS1-1

An atom has 10 protons, 15 neutrons and 10 electrons what is its mass number.

• 20

• 10

• 5

• 25

Tags

NGSS.MS-PS1-1

True/False: The mass number is the number of protons minus the number of neutrons

• True

• False

An atom of hydrogen has 1 proton and a atomic mass of 1.

How many neutrons must it have?

• 0

• 1

• 2

• 3

Tags

NGSS.MS-PS1-1

What is the atomic number of this atom shown in the Bohr model?

• 11

• 12

• 13

• 23

Tags

NGSS.MS-PS1-1

What is the mass number of the atom shown in the Bohr model?

• 11

• 12

• 23

• Can't be determined

Tags

NGSS.MS-PS1-1

What is the mass number for Argon?

• 10

• 20

• 40

• 60