1-1 Quiz In-Class Review 2025

Value representing the number of protons in an element

• Atomic Mass
• Mass Number
• Valence Electrons
• Atomic Number

The sum of the number of protons and the number of neutrons is called the _____

• atomic number
• mass number
• isotope number
• average weight

Tags

NGSS.MS-PS1-1

Calculation used to find the number of neutrons in an atom

• Mass number - protons

• protons- mass number

• Mass number - Electrons

• mass number + protons

Look at this picture of Argon off the periodic table. Which of the following is true for this element?

• 18 protons

• 40 protons

• 22 protons

• 21.9 protons

Tags

NGSS.MS-PS1-1

Look at this picture of Argon off the periodic table. Which of the following is true for this element when it is neutral?

• 18 electrons

• 40 electrons

• 22 electrons

• 21.9 electrons

Tags

NGSS.MS-PS1-1

Which part of an atom is used to identify it?

• number of protons

• number of neutrons

• number of electrons

Tags

NGSS.MS-PS1-1

When you have an ion of an atom, O^-2 for example, what has changed in the atomic structure?

• Number of protons

• Number of neutrons

• Number of electrons

Tags

NGSS.MS-PS1-1

How many electrons does O^-2 have?

• 6

• 8

• 10

• 16

• 18

Tags

NGSS.HS-PS1-1

How many electrons does Na⁺¹ have?

• 10

• 11

• 12

• 22

• 23

Tags

NGSS.MS-PS1-1

Iodine-131

The -131 tells you the

• number of protons.

• mass number

• charge of the atom.

• electrons

• neutrons

Tags

NGSS.HS-PS1-8