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Ira Lisetskai [31]
4 years ago
10

Two elements represents by the letter Q and R atomic number 9 and 12 respectively.

Chemistry
1 answer:
Liono4ka [1.6K]4 years ago
7 0

Answer:

The two elements with atomic number 9 and 12 are represented by letter Q and R respectively, where Q represents fluorine atom and R represents magnesium atom.

1. Electronic configuration of R that is magnesium (atomic number 12) is:

1s2 2s2 2p6 3s2

2. Q represents fluorine atom, which belongs to group 17 in periodic table that is the most reactive and lightest member of the group.

3. Q and R that is fluorine and magnesium combinely form magnesium fluoride or MgF2.

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