Which property of an atom is described by the atomic number?(1 point)

Question

Responses

its charge
its charge

​the number of neutrons
​the number of neutrons

the number of protons
the number of protons

its mass
Why is it impossible for an element to have an atomic number of 110.5? (1 point)
Responses

The atomic number is the number of protons, which is always a whole number.
The atomic number is the number of protons, which is always a whole number.

Atoms with atomic numbers greater than 100 are unstable.
Atoms with atomic numbers greater than 100 are unstable.

​Exactly half of the isotopes would need an atomic number of 110, and half would need an atomic number of 111, which is very unlikely.
​Exactly half of the isotopes would need an atomic number of 110, and half would need an atomic number of 111, which is very unlikely.

Atoms of an element all have the same whole number of protons and neutrons.
Atoms of an element all have the same whole number of protons and neutrons.
Why are there empty spaces in the rows on the periodic table?(1 point)
Responses

Because elements of the same size are found in the same rows.
Because elements of the same size are found in the same rows.

So that elements with similar properties are aligned in the same column.
So that elements with similar properties are aligned in the same column.

So that elements with similar masses are right next to each other.
So that elements with similar masses are right next to each other.

Because the elements on the periodic table are arranged by order of discovery.
How are elements arranged on the periodic table?(1 point)
Responses

They are arranged to highlight similarities between different elements.
They are arranged to highlight similarities between different elements.

They are arranged in order of the date of discovery.
They are arranged in order of the date of discovery.

They are arranged to highlight different elements with similar isotopes.
They are arranged to highlight different elements with similar isotopes.

They are arranged in order from most abundant to very rare and unstable.
Lithium has 3 protons, 4 neutrons, and 3 electrons. An element with which of these particles would have properties most similar to lithium?(1 point)
Responses

An element with 4 protons, 4 neutrons, and 3 electrons.
An element with 4 protons, 4 neutrons, and 3 electrons.

An element with 12 protons, 12 neutrons, and 12 electrons.
An element with 12 protons, 12 neutrons, and 12 electrons.

An element with 11 protons, 11 neutrons, and 11 electrons.
An element with 11 protons, 11 neutrons, and 11 electrons.

An element with ​10 protons, 12 neutrons, and 10 electrons.

Answer 1

Here are the correct responses to your questions:

1. Which property of an atom is described by the atomic number?

   • the number of protons

2. Why is it impossible for an element to have an atomic number of 110.5?

   • The atomic number is the number of protons, which is always a whole number.

3. Why are there empty spaces in the rows on the periodic table?

   • So that elements with similar properties are aligned in the same column.

4. How are elements arranged on the periodic table?

   • They are arranged to highlight similarities between different elements.

5. Lithium has 3 protons, 4 neutrons, and 3 electrons. An element with which of these particles would have properties most similar to lithium?

   • An element with 4 protons, 4 neutrons, and 3 electrons.

Let me know if you have any more questions!