Question

1. for each of the following isotopes, write the number of

	chromium-58	chromium-63
# of e-
# of n

Explanation:

Step1: Recall atomic number of Chromium

The atomic number of Chromium (Cr) is 24. The number of protons ($P+$) is equal to the atomic number.

Step2: Determine number of electrons

In a neutral atom, the number of electrons ($e-$) is equal to the number of protons.

Step3: Calculate number of neutrons

The mass - number of an isotope is the sum of protons and neutrons ($N$). So, $N=$ Mass number - Number of protons.

For Chromium - 58:

• Number of $P+$: 24 (since atomic number of Cr is 24)
• Number of $e-$: 24 (neutral atom)
• Number of $N$: $58 - 24=34$

For Chromium - 63:

• Number of $P+$: 24 (atomic number of Cr)
• Number of $e-$: 24 (neutral atom)
• Number of $N$: $63 - 24 = 39$

Answer:

	Chromium - 58	Chromium - 63
# of $e-$	24	24
# of $N$	34	39