Periodic Table Groups & Periods

The structure of all atoms has

• protons and neutrons in a central nucleus and electrons in shells around the nucleus.

• protons and electrons in a central nucleus and neutrons in shells around the nucleus.

• electrons and neutrons in a central nucleus and protons in shells around the nucleus.

• protons in a central nucleus and electrons and neutrons in shells around the nucleus.

The atomic and mass numbers of an atom are:

• atomic number = number of protons

  mass number = number of protons + neutrons

• atomic number = number of neutrons

  mass number = number of protons + neutrons

• atomic number = number of protons + neutrons

  mass number = number of protons

• atomic number = number of protons + neutrons

  mass number = number of neutrons

This atom of chromium, Cr, has

• 24 protons

  28 neutrons

  24 electrons

• 24 protons

  52 neutrons

  24 electrons

• 24 protons

  28 neutrons

  28 electrons

• 52 protons

  24 neutrons

  52 electrons

This ion of aluminium, Al, has

• 13 protons

  14 neutrons

  10 electrons

• 13 protons

  14 neutrons

  13 electrons

• 13 protons

  27 neutrons

  10 electrons

• 16 protons

  14 neutrons

  13 electrons

Isotopes are

• atoms with the same atomic number but differing mass numbers.

• atoms with the same mass number but differing atomic numbers.

• atoms with the same number of protons but differing numbers of neutrons.

• atoms that are identical.

The gold foil experiment proved that

• atoms have a dense positively charged nucleus.

• red arrows can change direction when they pass through atoms.

• only gold atoms have nuclei.

• most of the atom is empty space.

A group is a vertical column in the Periodic Table.

• True

• False

There are 7 periods in the Periodic Table.

• True

• False

There are 18 groups in the Periodic Table.

• True

• False

Phophorous (P) and sulfur (S) will have similar chemical properties because they are both in period 3.

• True

• False