Atomic Properties

Atoms of the same element with different number of neutrons are called

• isotopes

• metalloids

• transition elements

• radioactive

A certain atom has 26 protons, 26 electrons, and 30 neutrons. It mass number is _____.

• 26

• 30

• 52

• 56

Tags

NGSS.MS-PS1-1

Which subatomic particles contribute the most to the mass of an atom?

• Protons, Neutrons, Electrons
• Protons only
• Protons and Electrons
• Protons and Neutrons

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

• 20
• 10
• 5
• 25

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

The particles of the atom you can find by knowing the atomic number.

• neutrons
• protons and electrons
• protons and neutrons
• atomic mass

Tags

NGSS.MS-PS1-1

What does the C represent?

• atomic mass

• atomic number

• element name

• element symbol

What is the atomic mass of the atom pictured? 

• 9
• 10
• 18
• 19

Tags

NGSS.MS-PS1-1

This particle determines what element you have - the elements identity.

• electron
• proton
• neutron
• valence shell

The atomic number of Re is 75. The atomic mass of one of its isotopes is 186. How many neutrons are in an atom of this isotope?

• 75

• 111

• 186

• 261

Tags

NGSS.MS-PS1-1