The Atom

Where is most of the mass in an atom located?

• in the nucleus

• in the protons

• in the neutrons

• in the electrons

Tags

NGSS.MS-PS1-1

The positively charged particles of an atom are the ________.

• electrons

• protons

• neutrons

• protons & neutrons

Tags

NGSS.MS-PS1-1

The negatively charged particles of an atom are the ______.

• electrons

• protons

• neutrons

• protons & neutrons

Tags

NGSS.MS-PS1-1

Which statement best describes an electron?

• Smaller mass than a proton and a negative charge

• Smaller mass than a proton and a positive charge

• Greater mass than a proton and a negative charge

• Greater mass than a proton and a positive charge

Tags

NGSS.MS-PS2-3

What is the mass number of this element?

• 5

• 27

• 32

• 59

Tags

NGSS.MS-PS1-1

What is the atomic number?

• number of protons

• number of neutrons

a neutron has this charge

• negative

• positive

• neutral

What number indicates a proton?

• 1

• 2

• 3

• 4

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.