Mass Number

An element has the mass number 12 and atomic number 6. The number of neutrons in it is:

• 6

• 10

• 4

• 8

equal to the number of protons plus neutrons in the nucleus of an atom

• atomic mass

• atomic number

• isotope

• valence electrons

The fluorine atom has a mass number of

• 19

• 9

Tags

NGSS.MS-PS1-1

How many neutrons does this lithium atom have?

• 8

• 3

• 4

• 5

Tags

NGSS.MS-PS1-1

What is the Atomic Number of the element mentioned above

• 12

• 6

• C

• 16

Tags

NGSS.MS-PS1-1

What is the Mass Number of Nitrogen?

• 7

• 14.007

• 14

• 21

Tags

NGSS.MS-PS1-1

What is Atomic Mass Number ?

• Number of Protons

• Number of Neutrons

• Number of Protons and Neutrons

• Number of Protons and Electrons

What is the Atomic Mass Number of the element mentioned above

• 12

• 6

• C

• 16

Tags

NGSS.MS-PS1-1

An element has a mass number of 23 and an atomic number of 11. How many neutrons does it have?

• 12

• 11

• 23

• 10

Which of the following best describes the mass number of an atom?

• Number of protons

• Number of neutrons

• Number of protons and neutrons

• Number of electrons