Question

fill in the information for the anion $^{128}_{x}te^{- 2}$
x is the atomic number from the periodic table, 1
2 number of protons
3 number of neutrons
4 number of electrons
5 number of nucleons
a. 52 b. 54 c. 32 d. 78 e. 130 f. 76 g. 128

Explanation:

Step1: Find atomic number of Te

Looking up tellurium (Te) in the periodic table, its atomic number is 52.

Step2: Determine number of protons

The number of protons is equal to the atomic number, so it is 52.

Step3: Calculate number of neutrons

Mass - number is 128, atomic - number is 52. Neutrons = Mass number - Atomic number = 128 - 52 = 76.

Step4: Calculate number of electrons

It is a - 2 anion. Neutral Te has 52 electrons. So, number of electrons = 52+2 = 54.

Step5: Determine number of nucleons

Nucleons are protons + neutrons, or equal to the mass number. So it is 128.

Answer:

1. A. 52
2. A. 52
3. F. 76
4. B. 54
5. G. 128