A)Which statement describes the number of protons in each atom of an element?(1 point)

Question

Responses

The number of protons is given by the mass number, which increases by one moving down in its column in the periodic table.
The number of protons is given by the mass number, which increases by one moving down in its column in the periodic table.

The number of protons is given by the mass number, which increases by one moving from left to right across each row of the periodic table.
The number of protons is given by the mass number, which increases by one moving from left to right across each row of the periodic table.

The number of protons is given by the atomic number, which increases by one moving down in its column in the periodic table.
The number of protons is given by the atomic number, which increases by one moving down in its column in the periodic table.

The number of protons is given by the atomic number, which increases by one moving from left to right across each row of the periodic table.
The number of protons is given by the atomic number, which increases by one moving from left to right across each row of the periodic table.
Question 2
A)An element has an atomic number of 16. An ion of this element has a 2– charge. How was the ion formed?(1 point)
Responses

A neutral atom gained 2 electrons.
A neutral atom gained 2 electrons.

A neutral atom lost 2 electrons.
A neutral atom lost 2 electrons.

A neutral atom gained 16 electrons.
A neutral atom gained 16 electrons.

A neutral atom lost 16 electrons.
A neutral atom lost 16 electrons.
Question 3
A)Rubidium has an atomic number of 37 and a mass number of 85. How many protons, neutrons, and electrons does an ion of rubidium with a 1+ charge have?(1 point)
Responses

37 protons, 48 neutrons, and 38 electrons
37 protons, 48 neutrons, and 38 electrons

48 protons, 37 neutrons, and 38 electrons
48 protons, 37 neutrons, and 38 electrons

37 protons, 48 neutrons, and 36 electrons
37 protons, 48 neutrons, and 36 electrons

48 protons, 37 neutrons, and 36 electrons
48 protons, 37 neutrons, and 36 electrons
Question 4
A)There are three stable forms of neon: neon-20, neon-21, and neon-22. Which statement is true?(1 point)
Responses

They are radioactive, like all isotopes.
They are radioactive, like all isotopes.

The number of neutrons are the same.
The number of neutrons are the same.

Their atomic masses differ.
Their atomic masses differ.

Their number of protons differ.
Their number of protons differ.
Question 5
A)Beryllium has an atomic number of 4. How many neutrons does the isotope beryllium-9 have?(1 point)
Responses

9
9

5
5

13
13

4

Answer 1

Here are the correct responses for each of the questions based on the provided options:

Question 1: The statement that describes the number of protons in each atom of an element is:

• The number of protons is given by the atomic number, which increases by one moving from left to right across each row of the periodic table.

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Question 2: An element has an atomic number of 16, and an ion of this element has a 2– charge. The correct response is:

• A neutral atom gained 2 electrons.

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Question 3: For rubidium with an atomic number of 37 and a mass number of 85, the ion with a 1+ charge has:

• 37 protons, 48 neutrons, and 36 electrons.
  (Explanation: The mass number of 85 minus the atomic number of 37 gives 48 neutrons. A 1+ charge indicates that it lost one electron, so it has 36 electrons.)

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Question 4: Regarding the stable forms of neon (neon-20, neon-21, and neon-22), the true statement is:

• Their atomic masses differ.
  (Explanation: Isotopes differ in the number of neutrons, leading to different atomic masses, but they have the same number of protons.)

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Question 5: Beryllium has an atomic number of 4, and the isotope beryllium-9 has:

• 5 neutrons.
  (Explanation: The mass number (9) minus the atomic number (4) equals the number of neutrons, which is 5.)

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