Question

question 2 (1 point) massnumber1. a copper atom has 27 electrons and 34 neutrons. what is its mass number? 59 65 61 56 63

Explanation:

Step1: Identify number of protons

Equal to number of electrons, so 27.

Step2: Calculate mass number

Sum of protons and neutrons: \(27+34 = 61\).

Answer:

The mass number of an atom is the sum of the number of protons and neutrons. In a neutral atom, the number of electrons is equal to the number of protons. Given 27 electrons, there are 27 protons. With 34 neutrons, the mass number is \(27 + 34=61\). So the answer is 61.