Atomic Number, Mass Number & Average Atomic Mass

What does the atomic number tell us in a neutral atom? (select all correct answers)

• the number of protons

• the number of protons and electrons

• the number of protons and neutrons

• the number of neutrons

Tags

NGSS.MS-PS1-1

What does the mass number tell us?
(a)  

• the number of protons and neutrons
• the number of protons
• the number of neutrons
• the number of protons and electrons

What is the atomic number of this atom?

Mathematical Equivalence

ON

Tags

NGSS.MS-PS1-1

What is the mass number of this atom?

• 1

• 3

• 4

• 7

Tags

NGSS.MS-PS1-1

Atoms of the same element which have a different number of neutrons are called .

(a)  

• isotopes
• ions
• quarks
• molecules

Tags

NGSS.HS-PS1-8

How many neutrons does C-14 contain? (tap to enlarge the image)

Mathematical Equivalence

ON

Tags

NGSS.MS-PS1-1

How many neutrons does an atom of the isotope Neon-22 have? (tap to enlarge the image)12

Mathematical Equivalence

ON

Tags

NGSS.MS-PS1-1

How many electrons are in an neutral atom with an atomic number of 50?

Mathematical Equivalence

ON

Tags

NGSS.MS-PS1-1

which atom has  4 neutrons?

• Li-6
• Li-7
• Li-8
• they have the same # of neutrons

Tags

NGSS.MS-PS1-1

The average atomic mass of an element is the ___.

• average of the mass number and the atomic number for the element

• average of the masses of the isotopes of the element

• total mass of the isotopes of the element

• total number of subatomic particles in the nucleus