Elements in a vertical column on the Periodic Table have similar properties and are all members of the same of elements.
ME
A
molecule
HD
B
phase
С
atom
D
group

Consider the two electron arrangements for neutral atoms a and b. are atoms a and b the same element? a - 1s2, 2s2, 2p6, 3s1 b - 1s2, 2s2, 2p6, 5s1

Which of the following ocean acidification? are the most likely side effects of a ph less than 7.0 in the ocean b. more metal salts altering the ocean chemistry c. dissolution of the shells of marine organisms d. both a & b e. all of the above.

Calculate the number of kilojoules to warm 125 g of iron from 23.5°c to 78.0°c.