Question

Which of the following atoms has the same number of neutrons as 9Be?

9B

10B

10Be

12C

Answer 1

Beryllium-9 (9Be) has 5 neutrons. Upon evaluating options 9B, 10B, 10Be, and 12C, it is evident that 10B, or boron-10, has the same number of neutrons (5), matching that of 9Be.

Step-by-step explanation:

To determine which atom has the same number of neutrons as 9Be, we need to first understand the structure of the beryllium-9 atom. The atomic number of beryllium (Be) is 4, meaning it has 4 protons. Given that the mass number of 9Be is 9, we can calculate the number of neutrons by subtracting the atomic number from the mass number: 9 (mass number) - 4 (protons) = 5 neutrons.

Now, we evaluate each of the options to see which one also has 5 neutrons:
9B: Boron has an atomic number of 5, meaning it has 5 protons. With a mass number of 9, it would have 9 - 5 = 4 neutrons, which is not the same as 9Be.
10B: With 5 protons and a mass number of 10, it has 10 - 5 = 5 neutrons, which is the same as 9Be.
10Be: With 4 protons, and a mass number of 10, it has 10 - 4 = 6 neutrons, which is not the same as 9Be.
12C: Carbon has 6 protons. With a mass number of 12, it has 12 - 6 = 6 neutrons, which is not the same as 9Be.

Therefore, the atom that has the same number of neutrons as 9Be is 10B.

Answer 2

Answer: -

¹⁰B

Explanation: -

For ⁹Be,

The atomic number is 4.

The Mass number is 9.

The number of neutrons = mass number - atomic number

= 9 - 4 = 5

For ⁹B,

The atomic number is 5.

The Mass number is 9.

The number of neutrons = mass number - atomic number

= 9-5 = 4

For ¹⁰B,

The atomic number is 5.

The Mass number is 10.

The number of neutrons = mass number - atomic number

= 10-5 = 5

For ¹⁰Be,

TThe atomic number is 4.

The Mass number is 10.

The number of neutrons = mass number - atomic number

= 10-4 = 6

For ¹²C,

The atomic number is 6.

The Mass number is 12.

The number of neutrons = mass number - atomic number

= 12-6 = 6