What makes something radioactive?

• an unstable nucleus

• contaminated sewage

• elements with an atomic number above 81

• it decays over time

Tags

NGSS.HS-PS1-8

What is radioactive decay?

• The spontaneous breakdown of an atomic nucleus resulting in only energy release

• The spontaneous breakdown of an atomic nucleus resulting in only matter release

• The spontaneous breakdown of an atomic nucleus resulting in a release of energy and matter

• The decay of the use of radios and the increased use of televisions

One disadvantage of nuclear energy is _______.

• it is a fossil fuel

• it emits large amounts of pollution into the atmosphere

• it leaves behind radioactive waste

• there are not disadvantages

When does radioactive decay occur?

• When the nucleus of an isotope is unstable

• When the electrons of an isotope are spinning

• When the nucleus of an isotope is stable

• When the electrons of an isotope are shared with another isotope

A particle with a positive charge that determines the element

• proton

• nucleus

• neutron

• electron

This equation shows how mass and the speed of light convert to energy

• E=mc

• E=mc²

• E=mc³

• E=m

In E=mc² what does 'c' stand for?

• core

• carbon

• speed of light

• energy

______________ is a process by which unstable atoms emit radiation until they become stable.

• Radiation

• Chemical Reaction

• Radioactive Decay

• Isotopes

What is the smallest unit of matter? It is composed of protons and neutrons, held together in the nucleus, and electrons around the nucleus in different electron orbitals, which form an electron cloud.

• cell

• nucleus

• atom

• electron

What is the center of an atom containing protons and neutrons?

• nucleus

• neutron

• proton

• electron cloud