Question

How many protons, neutrons, and electrons are there in an atom of (a) 10B5, (b) 36Ar, (C) 85Sr38, and (d) carbon-Il?

Answer 1

To find the number of protons, neutrons, and electrons in an atom, you use the atomic number and mass number. In 10B5, there are 5 protons, 5 electrons, and 5 neutrons. In 36Ar, there are 18 protons, 18 electrons, and 18 neutrons. In 85Sr38, there are 38 protons, 38 electrons, and 47 neutrons. And in carbon-11, there are 6 protons, 6 electrons, and 5 neutrons.

Step-by-step explanation:

In order to find the number of protons, neutrons, and electrons in an atom, you need to know the atomic number and mass number of the element. The atomic number tells you the number of protons, and in a neutral atom, this is also equal to the number of electrons. The mass number tells you the total number of protons and neutrons in the nucleus.

Let's break down the examples:

1. a) 10B5: The atomic number is 5, so there are 5 protons and 5 electrons. The mass number is 10, so there are 10 - 5 = 5 neutrons.
2. b) 36Ar: The atomic number is 18, so there are 18 protons and 18 electrons. The mass number is 36, so there are 36 - 18 = 18 neutrons.
3. c) 85Sr38: The atomic number is 38, so there are 38 protons and 38 electrons. The mass number is 85, so there are 85 - 38 = 47 neutrons.
4. d) Carbon-11: The atomic number is 6, so there are 6 protons and 6 electrons. The mass number is 11, so there are 11 - 6 = 5 neutrons.