Question 21

Question

Question 21
A student looks up an element on the periodic table. The table says that the atomic number of the element is 12 and the mass number of the element is 40. What information do these two numbers convey about the element?

a
The element has 40 protons and 12 neutrons
 b
The element has 12 protons and 12 neutrons
 c
The element has 12 protons and has 28 neutrons
 d
The element has 28 protons and 40 neutrons
Question 22
In all elements in a group, the thing that is the same is the:

a
Number of electrons in the valence shell
 b
Number of electrons
 c
Number of protons
 d
Number of neutrons
Question 23
How many oxygen atoms are in the compound below:

a
6
 b
4
 c
2
 d
8
Question 24
Match each description to the correct type of bond.

Column A
Column A
1.

:

2.
A bond in which electrons are transferred from one atom to another.:
A bond in which electrons are transferred from one atom to another.
3.

:

4.
What type of bond is represented in the picture?

:
What type of bond is represented in the picture?

GPT-4o mini · Answer

Let's analyze and answer each question in turn.

Question 21: The atomic number of an element is equal to the number of protons it has. Therefore, with an atomic number of 12, the element has 12 protons. The mass number is the total number of protons and neutrons in the nucleus. If the mass number is 40 and there are 12 protons, we can determine the number of neutrons by the following calculation:

Mass number = Number of protons + Number of neutrons
40 = 12 + Number of neutrons
Number of neutrons = 40 - 12 = 28

So, the element has 12 protons and 28 neutrons.

Correct answer: c) The element has 12 protons and has 28 neutrons.

Question 22: In the periodic table, elements are arranged in groups (or families) that have similar chemical properties. The commonality among elements in the same group is the number of electrons in the valence shell.

Correct answer: a) Number of electrons in the valence shell.

Question 23: To answer this question, I need the formula of the compound. Since the formula isn't provided, I'll give a general explanation: The number of oxygen atoms in a compound can typically be determined by looking at its chemical formula. For example, in H₂O, there are 1 oxygen atom. In C₆H₁₂O₆, there are 6 oxygen atoms.

Please provide the chemical formula if you want a specific answer.

Question 24: To match the descriptions to the correct types of bonds:

For question 2: "A bond in which electrons are transferred from one atom to another." - This describes ionic bonding.

Without further clarification or a diagram for the last two items, I'm unable to precisely complete the matching. However, typically:

A covalent bond is where electrons are shared between atoms.
Metallic bonding involves the pooling of electrons in a lattice structure.

If you can provide the specific descriptions for items 3 and 4, I can complete the matches for you!