T1 AS LEVEL CHEMISTRY SY25-26

Front

What defines the identity of an element?

Back

The number of protons in the atom.

Front

What are isotopes?

Back

Isotopes are atoms of the same element with different numbers of neutrons.

Front

How can you deduce information about isotopes?

Back

By using mass numbers and atomic numbers.

Front

What is the difference between relative atomic mass and mass number?

Back

Relative atomic mass is the weighted average of isotopes, while the mass number is the total number of protons and neutrons.

Front

Give an example of an application of isotopes.

Back

Dating, medicine, or tracing.

Front

What is the order of orbital filling?

Back

1s → 2s → 2p → 3s → 3p → 4s → 3d.

Front

What are successive ionization energies?

Back

The energy required to remove electrons from an atom in its gaseous state.

Front

How can you predict an element's group or period using ionization data?

Back

By analyzing the patterns in ionization energies.

Front

What is stoichiometry?

Back

The calculation of reactants and products in chemical reactions.

Front

How do you calculate moles from mass?

Back

Moles = mass (g) / molar mass (g/mol).