The mass number of an element is 7 and number of neutrons in its atom is 4. What is the number of electrons in the atom?
A. 3
B. 4
C. 7
D. 11
Answer:A
The mass number of an element is 7 and number of neutrons in its atom is 4. What is the number of electrons in the atom?
A. 3 B. 4 C. 7 D. 11