Br2 is the correct answer
Answer:
The number of neutrons is entirely dependent on the Mass number of the particular atom. The standard mass for potassium is 39.
Potassium is element number 19, so it has 19 protons and 19 electrons in the neutral atom. It has therefore 39-19 = 20 Neutrons.
Explanation:
Answer:
true
Explanation:
you can't change it back, it's chemically changed
1 atm = 760 mmHg
29.8 mmHg / 760 mmHg * 1atm = 0.039 atm