Atomic Number and Mass

How many protons are in a sodium atom, Na? (tap to enlarge the periodic table)

• Sodium has 1 proton.

• Sodium has 3 protons.

• Sodium has 11 protons

Tags

NGSS.MS-PS1-1

What is the atomic number?

• the number of protons

• the number of protons and neutrons

• the number of neutrons

• the number of electrons

Use the model shown below to answer the following question. What is the mass number of the atom? (8.5A)

• 6

• 11

• 16

• 10

Tags

NGSS.MS-PS1-1

What is the ATOMIC NUMBER of this Atom?

Mathematical Equivalence

OFF

Tags

HS-PS1-1

Explain why isotopes of the same element have different mass numbers but the same atomic number.

• Isotopes have different numbers of protons.

• Isotopes have different numbers of electrons.

• Isotopes have different numbers of neutrons.

• Isotopes have different numbers of atoms.

Tags

DOK Level 3: Strategic Thinking

The atomic mass of an element is approximately equal to the sum of the number of:

• Protons and electrons

• Neutrons and electrons

• Protons and neutrons

• Neutrons and positrons

What is the ATOMIC NUMBER of this Atom?

Mathematical Equivalence

OFF

Tags

HS-PS1-1

What is the mass number of an atom with 6 protons, 6 neutrons, and 6 electrons?

• 6

• 12

• 18

• 24

If an atom has an atomic number of 8 and a mass number of 16, how many neutrons does it have?

• 8

• 16

• 24

• 32

Tags

DOK Level 2: Skill/Concept

What is the mass number of an atom with 6 protons and 7 neutrons?

• 6

• 7

• 13

• 14

Tags

DOK Level 1: Recall