Science: Matter and Energy Semester Exam

Front

Atoms of the same element with different mass numbers are called?

Back

isotopes

Front

What term refers to the minimum amount of fissionable material required for a chain reaction to occur?

Back

critical mass

Front

What is the mass number of the isotope 26/12 Mg?

Back

26

Front

Which image illustrates the Bohr model of the atom? [Image a], [Image b], [Image c], [Image d]

Back

[Image c]

Front

In what type of radioactive decay is an electron emitted?

Back

beta decay

Front

Type of radioactive decay that releases energy without changing the number of protons and neutrons.

Back

gamma decay

Front

An unstable atom ejects a clump of two protons and two neutrons. What type of nuclear decay is this?

Back

alpha decay

Front

What idea states that tiny particles do not absorb or release energy in a smooth flow but in specific amounts?

Back

quantum theory

Front

What idea states that no two electrons in an atom can have the same set of four quantum numbers?

Back

Pauli exclusion theory

Front

Identify the only metal that is liquid at room temperature.

Back

mercury