Hcl + naoh → h2 + nacl
in which of these would the reaction rate be the quickest?

a) a 1m hcl solution reacts with a 1m naoh solution
b) a 1m hcl solution reacts with a 2m naoh solution
c) a 2m hcl solution reacts with a 1m naoh solution
d) a 2m hcl solution reacts with a 2m naoh solution

the density(ratio between mass and volume as m/v) decreases from top to bottom in periodic table group as the size increases and nuclear charge decreases. but in periods density increases from left to right as atom size decreases and nuclear charge increases.

answer:

the answer is 6 valence electrons.

explanation:

valence is the # of electrons on the outer most shell of an atom.

oxygen has 6.

although, the valency of oxygen is 2, because it only needs to make 2 covalent bonds, or gain 2 electrons, to achieve the stable octet configuration of a noble gas.

that's it!

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~ trueboss72