Atoms, Periodic Table, and Radioactivity

What is the smallest particle of an element that retains the properties of that element?

• Proton

• Atom

• Cell

• Molecule

What is the total number of protons and neutrons in an atom's nucleus called?

• Electron number

• Atomic number

• Mass number

• Isotope number

Which subatomic particle has a negative charge?

• Electron

• Photon

• Neutron

• Proton

What is the term for the number of protons in the nucleus of an atom?

• Nuclear count

• Proton number

• Atomic mass

• Atomic number

Tags

NGSS.HS-PS1-7

What is the term for the center of an atom where protons and neutrons are located?

• Nucleus

• Electron shell

• Orbit

• Proton cloud

What is the term for a substance that cannot be broken down into simpler substances by chemical means?

• Element

• Compound

• Molecule

• Isotope

What is the term for a substance that is made up of only one type of atom?

• Element

• Compound

• Molecule

• Isotope

What is the symbol for...

bromine

• Br
• B
• Be
• R

What element is...

Cu

• cerium
• scandium
• cesium
• copper

The elements in Group 17 have ____ valence electrons.

• 17

• 1

• 7

• 0