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frozen [14]
3 years ago
9

How many protons,neutrons and electrons are present in an atom of hafnium,hf,with a mass number of 178?

Chemistry
2 answers:
AleksAgata [21]3 years ago
7 0
178 of each species
178 protons
178 neutrons
And 178 electrons
AlladinOne [14]3 years ago
4 0

Answer:

72 protons

102 neutrons

72 electrons

Explanation:

Hf has an atomic number of 72. By definition, this means that it has 72 protons.

It also has a mass number of 178. The mass number (A) counts all elements with significant mass (protons and neutrons). Then,

A = p⁺ + n⁰

n⁰ = A - p⁺ = 178 - 72 = 102

Hf has 102 neutrons.

Elemental Hafnium is electrically neutral because it has the same amount of  positive charges (protons) and negative charges (electrons). Then, it must have 72 electrons.

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