When writing the electron configuration for Boron (5 electrons) we start filling first the first energy level (the 1s) before the second energy level (before the 2s). Name the rule that says this is so and EXPLAIN THAT RULE IN YOUR OWN
WORDS.

Thus, the first level can contain up to 2 electrons, 2(12) = 2; the second up to 8 electrons, 2(22) = 8; the third up to 18, 2(32) = 18; and so on

Explanation:

un recipient conține 6,4 moli de gaz. gazul hidrogen reprezintă 25% din totalul kilometrilor din container. în cazul în care presiunea totală este de 1.24 atm ceea ce este

the answers are

c and c