B - two hydrogen atoms and one oxygen atom
Answer:
Group of highly-reactive chemical elements. The alkali metals are a group (column) in the periodic table consisting of the chemical elements lithium (Li), sodium (Na), potassium (K), rubidium (Rb), caesium (Cs), and francium (Fr).
Answer:
C. because the 4s orbital is at a lower energy level
H.
represents hydrogen element. under non metal classification.
for others, you'll find them under metal element classification.
