If two atoms are bonded with a bond energy of 87 kj, what must be done to break the bond?
a. 87 kj of energy must be added
b. the energy must be decreased by 87 kj.
c. the bond order has to be higher.
d. no energy should come out or go in.

periodic trends is an atom that gets larger as the number of electronic shells increase, the radius of atoms increases as you go down a certain group in the periodic table of elements. in general, the size of an atom will decrease as you move from left to right of a certain period.

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