Question

which scientists experiment led to the discovery of the electron? rutherford bohr thomson dalton an atom has 15 protons and 16 neutrons. its mass number is: 15 16 31 46 the modern atomic model describes electrons as:

Explanation:

Step1: Recall electron - discovery scientist

J. J. Thomson's cathode - ray tube experiments led to the discovery of the electron.

Step2: Recall mass number formula

The mass number (A) of an atom is the sum of the number of protons (p) and neutrons (n). Given p = 15 and n = 16, then A=p + n=15 + 16 = 31.

Answer:

1. C. Thomson
2. C. 31