Answer: C. Number of valence electrons
Explanation: A group is a vertical column in the periodic table, which signifies the number of valence shell electrons in an element's atom. Example: all the elements in group 1 have 1 electron in their outer most shell.
Answer:
D. 2 NO3(aq)+Ca2+
Explanation:
there it is fella tried on ma own
C) This model describes the dissemination of electrons in protons as analogous to figs in the cooked plum pudding batter.