Chemistry NCFE Review

Front

What is the electronic configuration of calcium?

Back

1s² 2s² 2p⁶ 3s² 3p⁶ 4s²

Front

Which element has the greatest atomic radius?

Back

Cesium (Cs)

Front

What is the molecular formula of a compound consisting of 56.38% phosphorus and 43.62% oxygen with a molecular mass of 220 g/mole?

Back

P₄O₆

Front

What is the remaining amount of a 1.00 g sample of a radioactive isotope after 1 hour if its half-life is 20 minutes?

Back

0.125 g

Front

How are compounds with metallic bonds similar to ionic compounds?

Back

Both tend to have high melting points.

Front

Define atomic radius.

Back

The distance from the nucleus of an atom to the outermost shell of electrons.

Front

What is the significance of half-life in radioactive decay?

Back

Half-life is the time required for half of the radioactive atoms in a sample to decay.

Front

What is the difference between ionic and covalent bonds?

Back

Ionic bonds involve the transfer of electrons, while covalent bonds involve the sharing of electrons.

Front

What is a molecular formula?

Back

A molecular formula shows the number and type of atoms in a molecule.

Front

What is the principle behind the periodic table?

Back

Elements are arranged by increasing atomic number and similar chemical properties.