Chapter 16

Neutral atoms have no electric charge because they

• have an equal number of charged and noncharged particles

• have neutrons in their nuclei

• have an equal number of electrons and protons

• have an equal number of neutrons and protons

oxygen has atomic number of 8. this means that an oxygen atom has

• 8 neutrons in its nucleus

• 8 protons in its nucleus

• a total of 8 protons and neutons

• a total of 8 neurons and electrons

Tags

NGSS.MS-PS1-1

The Greek philosopher Democritus named what word for a tiny piece of matter that cannot be divided?

• element

• atom

• electron

• molecule

What does the number 5 represent

• The number of protons

• the number of neutrons

• the number of neutrons and protons

• the atomic mass

who said atoms have positive and negative parts also known as the plum pudding model or the chocolate chip ice cream model.

• Bohr

• Dalton

• Thompson

• Rutherford

Atoms of the same element with the same number of protons, but different numbers of neutrons are called

• metals

• isotopes

• metalloids

• radioactive elements

What group is this element in

• 4

• 5

• 6

• 7

The chemical symbol represents the __________of an element

• group

• structure

• name

• reaction

In Niels Bohr's model of the atom, electrons move

• like balls rolling down a hill

• like planets orbiting the sun

• like popcorn in a popcorn popper

• like beach balls on water waves

in stars, energy is produced primarily as hydrogen atoms are combined to form

• helium atoms

• carbon atoms

• oxygen atoms

• nitrogen atoms

Tags

NGSS.HS-ESS1-1

NGSS.HS-ESS1-3