1.) Na
2.) Cl ( at the second blank)
sodium metal+hydrochloric acid
The direction of heat flow is increased which means blocks temperature is higher and hotter than it was before
Answer:
Periods are horizontal rows (across) the periodic table, while groups are vertical columns (down) the table. Atomic number increases as you move down a group or across a period.
(Love your pfp btw)
Explanation: