Structure of the Atom

The nucleus of an atom makes up _____ of its mass.

• Almost none

• 50%

• 90%

• 99.9%

What is the relationship between the size of the nucleus and the size of the atom?

• The nucleus is about half the size of the atom.

• The nucleus is twice as big as the atom.

• The nucleus is about 100 times smaller than the atom.

• The nucleus is about 100,000 times smaller than the atom.

Neutrons have __________ charge.

• positive

• negative

• no

Match the following

• Electron Cloud

• This space surrounding the nucleus that has an overall negative charge

• Valence Electron

• This subatomic particle contributes to the overall mass but not its charge

• Neutron

• The smallest particle of an element that still has the element's properties

• Atom

• Located in the outermost energy level of the electron cloud, with the most energy

• Proton

• The subatomic particle is what gives the nucleus an overall positive charge

Protons have __________ charge.

• positive

• negative

• no

Electrons have __________ charge.

• positive

• negative

• no

Tags

NGSS.MS-PS2-3

Which particle has almost no mass?

• Protons

• Neutrons

• Electrons

Which best describes the movement of electrons?

• They follow fixed paths in the atom.

• They move slowly.

• They are constantly moving.

• They only move when the atom is part of a gas.

Most of the atom is empty space.

• True.

• False.

What does amu stand for?

• Atom matter unit

• Atomic mass unit

• All mighty unicorn

Tags

NGSS.MS-PS1-5