Atoms

Front

What is the half-life of iodine-131? Options: 32 days, 8 days, 16 days, 24 days

Back

8 days

Front

Which subatomic particle has a negative charge?

Back

electron

Front

The atomic mass on the periodic table is an average of all the ____ of an element based on abundance.

Back

isotopes

Front

An electron has a negative charge and a mass of ___ amu.

Back

0

Front

How can the number of protons in an element be found?

Back

Looking up the atomic number

Front

A neutral atom of the element sodium has 11 protons and ____ electrons.

Back

11

Front

Do the following atoms belong to the same element? Aluminum-27 and an atom with 14 protons and 13 neutrons.

Back

No because they have different number of protons

Front

What is the mass number?

Back

the number of protons and neutrons

Front

What is the atomic number of this atom? Options: 4, 5, 9, none of the above

Back

4

Front

What is a proton made up of?

Back

two up quarks and one down quark