Question 27

Question

Question 27
Why does the chloride ion have a -1 charge?

a
Chlorine atoms lose an electron.
 b
Chlorine atoms have no electrons.
 c
Chlorine atoms share electrons.
 d
Chlorine atoms gain an electron.
Question 28
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 29
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

GPT-4o mini · Answer

Here are the answers to the questions you've provided:

Question 27:
Why does the chloride ion have a -1 charge?
Answer: d. Chlorine atoms gain an electron.
This is because when a chlorine atom gains an electron, it achieves a stable electronic configuration (similar to that of noble gases) and thus carries a -1 charge.

Question 28:
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?
Answer: c. The element has 12 protons and has 28 neutrons.
The atomic number (12) indicates the number of protons, and the mass number (40) is the sum of protons and neutrons. Therefore, the number of neutrons can be calculated as 40 - 12 = 28.

Question 29:
In all elements in a group, the thing that is the same is the:
Answer: a. Number of electrons in the valence shell.
Elements in the same group (column) of the periodic table have the same number of valence electrons, which determines their chemical properties.

If you have any more questions or need further clarification, feel free to ask!