Question

Q21. Sam goes to four different clubs
each week. At which of these clubs
does he stay for the longest
duration?
Art dub
Mula elab
Science dub
Suloning club
O A. Science Club - 75 minutes
O B. Art Club - 2 hours
C. Swimming Club - 1 hour
O D. Music Club - 45 minutes
Q22. At the start of April there were​

Answer 1

Answer:

Isotopes are atoms of the same element with different numbers of neutrons. Because they contain different numbers of neutrons, isotopes have different atomic masses. The average atomic mass of an element is calculated by taking the weighted average mass of the element's naturally occurring isotopes.

plz _fOllow