Which ion was formed by providing the second ionization energy to remove an electron? Ca2+ N3– Fe3+ S2–

trigonal pyramidal

tetrahedral

trigonal planar

bent

1. a)c-14 has two more protons

2. d)they have different numbers of protons, neutrons, and valence electrons; they are all gases at room temperature.

3. c) iron and nickel.

nuclear fission produces elements that are heavier than helium.

the elements that are used in nuclear fission and their products are much heavier than helium.