Select all the correct answers. which reactions are single displacement reactions? 2nabr + caf2 → 2naf + cabr2 sno2 + 2h2 → sn + 2h2o 4na + o2 → 2na2o 2kclo3 → 2kcl + 3o2 2al + 6hcl → 2alcl3 + 3h2

"the periodic table is arranged in order of atomic number."

14 days is the half-life of phosphorus-32

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

i think it's c. if you look search electronic symbol on google and then click on wiki it shows you a