If E is the symbol for an element, which two of the following represent isotopes of the same element
1) 20 E 10
2) 21 E 9.
3) 20 E 11.
4) 21 E 10
Answer: 1 & 4
If E is the symbol for an element, which two of the following represent isotopes of the same element
1) 20 E 10
2) 21 E 9.
3) 20 E 11.
4) 21 E 10
Answer: 1 & 4