What does it mean that a hypothesis must be ‘falsifiable’ in order to be valid? A. It must have the ability to be proven wrong by some test.
B. It must be wrong the first time, or you did not learn anything.
C. It cannot be wrong, or the experiment would be pointless.
D. It must conform to experimental standards.

the answer is 1260

you spend 7 hours in school for 1 school day with 5 school days in 1 school week with 36 school weeks in a school year.

7*5*36= 1260 it's all about multiplying

atomic mass = 39

number of neutrons = 20

number of protons= 19

electronic configuration = 1s2 2s2 2p6 3s2 3p6 4s1

the number of electron in first shell = 2

number of electrons in n=3 shell = 8