The periodic table is organized by a) atomic mass. b) atomic size. c) atomic number. d) atomic periodicity.

The correct option is: c) atomic number

Explanation:

The periodic table is a table in which all the chemical elements are organized in the increasing order of atomic number (Z), which is unique for each chemical element.

The atomic number of a neutral element is equal to the number of protons present in the nucleus of the atom and the number of electrons in the atom.

- 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

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