State the symbol for an atom of the element missing from the Periodic Table below.

State the symbol for an atom of the element missing from the Periodic Table below.

Analysis of a sample of bromine in a mass spectrometer showed that it contained a mixture of the ⁷⁹Br and ⁸¹ Br isotopes in the proportions:

How many orbitals are occupied

in a silicon atom?

What is the maximum number of electrons that can exist in a p orbital

The total number of protons plus neutrons in the atom shown above is

The number of electrons in the atom shown above is

The atomic number of the atom shown above is

Different forms of the same element, with atoms arranged in a different structure (graphite, graphene, diamond and fullerenes for example).

The sentence above describes…

The

dot-and-cross diagram below represents the electronic structure of a sulfur

hexafluoride molecule

Correct statements about sulfur hexafluoride include:

1. All

   S-F bonds are equivalent (the same)

2. SF₆

   is a polar molecule

3. SF₆

   is a planar molecule