There's no 'formula' for an atom. Essentially you just use the name from the Periodic Table of elements.
'Formula' only comes in (in a meaningful way) for molecules.
K20Br20 is just KBr. The individual molecules for that form from these elements are not a chain of 20 potassium atoms and 20 bromine atoms linked together, they are a single potassium atom and a single bromine atom bonded.
The VSEPR formula for the nitrogen atom as the central atom in glycine is Ax3e.
twelfth
Well, you didn't indicate the atom so I'll do what I can. The formula for acetic acid is CH3COOH. If the indicated letter in the formula is C, the atom is carbon. If the indicated letter in the formula is H, the atom is hydrogen. If the indicated letter in the formula is O, the atom is hydrogen.
H2O. It is the formula of water.
Bromine atom= [Br]
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How do you writte a bibiography?
No subscripts mean only one atom in formula. Example: KCl - 1 atom of potassium, 1 atom of chlorine.
Oxidation state is what determines the number of each atom. This is in the ionic formula.
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With your hands