Atomic Theory.

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

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

number of neutrons =  _____

• atomic number - mass number
• isotope number - atomic weight
• mass number - atomic weight
• mass number - atomic number

The middle of the atom, which contains protons and neutrons, is called _____

• the shell
• the nucleus
• the cell
• the control center

Tags

NGSS.MS-PS1-1

Which subatomic particle has a relative charge of +1?

• the proton
• the neutron
• the electron
• the photon

Which subatomic particle has no electric charge?

• the proton
• the neutron
• the electron
• the photon

Which subatomic particle has a relative charge of -1?

• the proton
• the neutron
• the electron
• the photon

Different versions of an element, with differing numbers of neutrons, are called _____

• isosceles
• isomers
• isotopes
• isicless

For an atom to be electrically neutral, it must contain the same number of _____

• protons and neutrons
• neutrons and electrons
• protons and electrons
• nucleons and electrons

If you want to know which atom an element is, then count the _____

• protons
• neutrons
• electrons
• nucleons

Tags

NGSS.MS-PS1-1

For a given element, the atomic number indicates the number of _____

• protons in the nucleus
• neutron in the nucleus
• electrons in the atom
• nucleons in the atom

Tags

NGSS.MS-PS1-1