Kcal=1000 cal
Min=60 sec
0.74 *1000= 740cal/min
740 cal/min /60= 12.333 cal/s
Calcium is in group IIA in the periodic table. A Ca ion has a charge of 2+. In order to solve this problem you can either see the periodic table or just look for the charge of the elemetns they give you.
K is group IA - charge of 2+
Magnesium IIA - charge 2+
Bromine VIIA charge of 1-
Scandium IB
The answer is B
Answer:
On the placement of hydrogen and helium in the periodic system
H1=1
He2=2