An atom of fluorine has an atomic number of 9 and an atomic mass of 19. the atom contains
select one:
a. 19 protons, 19 electrons, and 9 neutrons.
b. 19 protons, 10 electrons, and 9 neutrons.
c. 9 protons, 10 electrons, and 10 neutrons.
d. 9 protons, 9 electrons, and 10 neutrons.

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- calcium has greater affinity to bond with electron receptors than hydrogen does and hence, it has the ability to replace hydrogen in most of its compounds.

- lithium has 2 valence electrons in the product because it can make only 1 bond with hydrogen. beryllium has 4 valence electrons in the product because it can only make 2 bonds. it has fewer electrons than neon and can react with electron donors. each hydrogen has 2 valence electrons, the same as helium.

- the covalent bond formed between carbon and hydrogen is polar because carbon is more electronegative than hydrogen and it attracts the bonded electron pair closer to itself, thus giving hydrogen a partial positive charge.

- a hydrogen bond is a relatively weak bond that hydrogen atoms make with the electronegative atoms nitrogen, oxygen or fluorine.

so the best choice is a.) 2 calcium (ca) atoms