The Periodic Table Online Practice

Question

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Question
Krypton has an atomic number of 36 and a mass number of 84. Which statement describes a neutral atom of krypton?(1 point)
Responses

It has the same number of protons as neutrons, but it has a greater number of electrons.
It has the same number of protons as neutrons, but it has a greater number of electrons.

It has the same number of protons as electrons, but it has a lesser number of neutrons.
It has the same number of protons as electrons, but it has a lesser number of neutrons.

It has the same number of protons as electrons, but it has a greater number of neutrons.
It has the same number of protons as electrons, but it has a greater number of neutrons.

It has the same number of protons as neutrons, but it has a lesser number of electrons.

Answer 1

In a neutral atom of an element, the number of protons is equal to the number of electrons.

For krypton (Kr):

• Atomic number = 36, which means it has 36 protons.
• Mass number = 84, which is the sum of protons and neutrons.

To find the number of neutrons: Mass number = Number of protons + Number of neutrons 84 = 36 protons + Number of neutrons Number of neutrons = 84 - 36 = 48

Thus, a neutral atom of krypton has:

• 36 protons
• 36 electrons
• 48 neutrons

So, the correct statement is: "It has the same number of protons as electrons, but it has a greater number of neutrons."