Question 1

What elements are included in Group 7 of the Periodic Table?

Accepted Answer

Group 7 of the Periodic Table, also known as the halogens, includes the elements fluorine (F), chlorine (Cl), bromine (Br), iodine (I), and astatine (At). These elements are known for their high reactivity and are found in the penultimate column of the Periodic Table.

Question 2

Why are Group 7 elements called halogens?

Accepted Answer

Group 7 elements are called halogens, which comes from the Greek words 'halos' meaning salt and 'genes' meaning forming. This is because they readily form salts when they react with metals. For example, sodium chloride (table salt) is formed when chlorine reacts with sodium.

Question 3

How does the reactivity of Group 7 elements change down the group?

Accepted Answer

In Group 7, the reactivity of the elements decreases as you move down the group. This is because the outer electrons are further from the nucleus and are more shielded by inner electrons, making it harder for the atom to attract additional electrons needed for reactions.

Question 4

What are some common uses of Group 7 elements?

Accepted Answer

Group 7 elements have various applications. Chlorine is used in water purification and disinfectants, bromine is used in flame retardants, iodine is essential in medicine and nutrition, and fluorine is used in toothpaste to prevent dental cavities. These uses highlight the importance of halogens in everyday life.

Question 5

How do Group 7 elements form compounds with metals?

Accepted Answer

Group 7 elements form ionic compounds with metals by gaining one electron to achieve a stable electronic configuration. For example, when chlorine reacts with sodium, it gains an electron from sodium to form sodium chloride (NaCl), a stable ionic compound. This electron transfer results in the formation of a negatively charged halide ion.

Group 7

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Frequently Asked Questions about Group 7

What elements are included in Group 7 of the Periodic Table?

Why are Group 7 elements called halogens?

How does the reactivity of Group 7 elements change down the group?

What are some common uses of Group 7 elements?

How do Group 7 elements form compounds with metals?