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.
Answer:
Pneumonia: movement of mucus from lungs
Explanation:
Pneumonia is an infection that inflames your lungs' air sacs (alveoli). The air sacs may fill up with fluid or pus, causing symptoms such as a cough, fever, chills and trouble breathing.
Pls give brainlist
C sea water
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Answer:
Please mention elements so i can answer it
Explanation:
Answer:
2Al+Fe2O3-->2Fe+Al2O3
Explanation:
make sure there are the same no. of atoms on each side