Emma SCI Atom and Atomic Theory

Front

Mass of 2.5 mol of Ca (molar mass = 40 g/mol)?

Back

100.0 g Ca

Front

How many valence electrons does Potassium (K) have?

Back

1

Front

Avogadro's number is useful for

Back

counting atoms

Front

The charge of a stable atom is

Back

neutral

Front

An iron (Fe) atom has an atomic mass of 56 and an atomic number of 26. How many neutrons does this iron atom have?

Back

30

Front

An element's atomic number is equal to its number of

Back

protons

Front

An element's mass number is equal to its number of what?

Back

protons + neutrons

Front

An element's net charge is equal to the difference of the charges of what?

Back

electrons

Front

Two different isotopes of an element have a different...

Back

number of neutrons

Front

Mass number of an element with 19 protons, 19 electrons, and 20 neutrons?

Back

39