Question

In a class test containing 15 questions 4 marks were given for each correct answer and -2 marks were given to wrong answers. Anu attempted all questions but only 7 of his answers were correct. What was his score​

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.

#JUST_SpAmming