structure of atom class9

A positively charged particle found in the nucleus is called a

• neutron.

• proton.

• electron.

• positron.

Tags

NGSS.MS-PS1-1

Electrons are subatomic particles that exist

• inside the nucleus.

• in simultaneous dimensions.

• in parallel universes.

• outside the nucleus.

Tags

NGSS.MS-PS1-1

Neutrons have almost exactly the same mass as

• electrons.

• positrons.

• protons.

• quarks.

Tags

NGSS.HS-PS1-8

Because atoms are neutral, each positive charge is

• the same as a neutral charge.

• balanced by a negative charge.

• the same as no charge.

• balanced by a neutral charge.

Tags

NGSS.MS-PS1-1

Which statement best describes the mass number (#) of an atom?

• the sum of electrons and neutrons in the nucleus

• the sum of protons & neutrons in the nucleus

• the difference in mass between protons & neutrons

• the difference in mass between electrons and neutrons

Tags

NGSS.MS-PS1-1

Every neutral atom has the same number of protons and electrons, however

• they may not have the same # of neutrons.

• they cannot combine with other atoms.

• they cannot form isotopes.

• they may also have the same atomic mass.

Tags

NGSS.HS-PS1-8

When an atom contains more electrons than protons, it is

• a neutral atom with no charge

• an ion and negatively charged

• an ion and positively charged

• an isotope and has more mass

Tags

NGSS.MS-PS1-1

If a carbon atom has six protons and has a mass of 13 amu, how many neutrons are in that carbon atom?

• 5

• 6

• 7

• 8

Tags

NGSS.MS-PS1-1

A certain atom has 26 protons, 26 electrons, and 30 neutrons. What is its mass number?

• 26

• 30

• 52

• 56

Tags

NGSS.MS-PS1-1

What is the nucleon number of sodium?

• 11

• 23

• 12