Unit Review Atomic, Radioactivity, Half-life, Transmutation

Compared to other subatomic particles, the proton is _____

• heavy and neutral

• heavy and negatively charged

• heavy and positively charged

• light and negatively charged

Compared to other subatomic particles, the electron is _____

• heavy and positively charged

• light and positively charged

• light and neutral

• light and negatively charged

Which subatomic particles determine the identity of an element?

• electrons

• protons

• neutrons

• photons

Nuclei are held together by the strongest of the four fundamental forces of physics, _____

• the electrostatic force

• the gravitational force

• the strong nuclear force

• the weak nuclear force

Neutrons serve as a kind of _____

• charge carrier
• shock absorber for collisions
• shield for radiation
• buffer between the protons

A neutron changes into a proton and an electron during ________________.

• alpha decay

• beta decay

• gamma decay

• all of the above

• alpha & beta decay

This particle has 2 protons and 2 neutrons like a helium nucleus.

• alpha particle

• beta particle

• gamma photon

• alpha and gamma particles

• none of the above

This type of decay creates a new element

• alpha

• gamma

• alpha and beta

• none of the above

• beta

How many neutrons does the isotope of lithium have?

• 8

• 3

• 5

If a hydrogen atom has 1 proton, 1 electron, and 1 neutron, its atomic number is:

• 1
• 2
• 3