Question

8 класс химия What is the atomic mass number of Cr+3 that has 21 electrons and 29 neutrons? Show your solution плиссс помогите

Answer 1

Ответ:

e=21

n=29

p=e  21=21

p+n=Atomic mass  21+29=50  

Atomic mass=50

Объяснение:

Answer 2

To find the atomic mass number (also known as the mass number) of a Cr+3 ion that has 21 electrons and 29 neutrons, you can follow these steps:

1. Determine the atomic number of chromium (Cr). Chromium has an atomic number of 24, which means it has 24 protons in its nucleus.

2. Since the ion is Cr+3, it has lost 3 electrons compared to the neutral chromium atom. Therefore, it has 24 - 3 = 21 electrons.

3. The atomic mass number (A) is the sum of protons and neutrons in the nucleus. You are given that it has 29 neutrons.

4. Use the formula for the atomic mass number:

   A = Number of protons + Number of neutrons

   A = 24 (protons) + 29 (neutrons)

5. Calculate the atomic mass number:

   A = 24 + 29 A = 53

So, the atomic mass number of the Cr+3 ion with 21 electrons and 29 neutrons is 53.