Answer:
half-life, in radioactivity, the interval of time required for one-half of the atomic nuclei of a radioactive sample to decay (change spontaneously into other nuclear species by emitting particles and energy), or, equivalently, the time interval required for the number of disintegrations per second of a radioactive ...
Explanation:
braniest
C
i think i am sorry if am wrong
C is the answer because he wants to know if less force is needed to pull on a slippery surface which reduces friction
Answer:
the atomic number is how you find the charge
