Question

A certain isotope contains 53 protons, 78 neutrons, and 54 electrons.

a) What is its atomic number?

b) What is the mass number of this atom?

c) What is the name of this element?

d) Identify 2 other elements that are in the same group as this element?

Answer 1

The isotope with 53 protons, 78 neutrons, and 54 electrons has an atomic number of 53, mass number of 131, and is the element Iodine (I). Two other elements in the same group are Chlorine (Cl) and Fluorine (F).

Step-by-step explanation:

The isotope in question can be identified through a series of steps:

1. Atomic number: This is the number of protons in an atom's nucleus and defines the element. Our isotope contains 53 protons, so its atomic number is 53.
2. Mass number: The mass number is the sum of protons and neutrons in the nucleus. Since our isotope contains 53 protons and 78 neutrons, its mass number is 53 + 78 = 131.
3. Element name: An element with an atomic number of 53 is known as Iodine (I).
4. Other elements in the same group: Iodine belongs to the halogen group, which includes elements like Chlorine (Cl) and Fluorine (F).

To summarize, the answers are:

• a) Atomic number: 53
• b) Mass number: 131
• c) Element: Iodine (I)
• d) Two other elements in the same group: Chlorine (Cl), Fluorine (F)