An uncharged atom of chlorine has 17 electrons and 18 neutrons in its structure. What is t… — Armed Services Vocational Aptitude Battery (ASVAB)

An uncharged atom of chlorine has $17$ electrons and $18$ neutrons in its structure. What is the mass number of this chlorine atom?

Answer: 35

The mass number of the chlorine atom is

35

For an uncharged atom, the number of protons equals the number of electrons (

17

). The mass number is the sum of protons and neutrons (

17 + 18 = 35

Determine the number of protons in the atom

17

protons

In any electrically neutral atom, the number of positively charged protons is equal to the number of negatively charged electrons.

Add the number of protons and neutrons together

17 + 18 = 35

The mass number (

A

) of an atom is defined as the total number of protons plus neutrons located in its nucleus.

The mass number of an atom is the sum of its protons and neutrons. In a neutral atom, the number of protons equals the number of electrons.

Estimated Time:45s

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