The most reactive elements of the alkali metals and halogens are Caesium and Fluorine. So, the correct answer is C. Caesium and Fluorine.

Here's why:

1. Alkali metals are the elements in Group 1 of the periodic table. They are Lithium, Sodium, Potassium, Rubidium, Caesium, and Francium. These elements are known for their high reactivity, which increases as you move down the group in the periodic table. This is because as you move down the group, the outermost electron is further from the nucleus and is therefore more easily lost, leading to a higher reactivity. Therefore, among the alkali metals, Caesium is the most reactive.

2. Halogens are the elements in Group 17 of the periodic table. They are Fluorine, Chlorine, Bromine, Iodine, and Astatine. These elements are also known for their high reactivity, but in this case, reactivity decreases as you move down the group. This is because as you move down the group, the outermost shell is further from the nucleus, making it harder to attract additional electrons, leading to a lower reactivity. Therefore, among the halogens, Fluorine is the most reactive.

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The most reactive elements of the alkali metals and halogens are Caesium and Fluorine. So, the correct answer is C. Caesium and Fluorine.

Here's why:

1. Alkali metals are the elements in Group 1 of the periodic table. They are Lithium, Sodium, Potassium, Rubidium, Caesium, and Francium. These elements are known for their high reactivity, which increases as you move down the group in the periodic table. This is because as you move down the group, the outermost electron is further from the nucleus and is therefore more easily lost, leading to a higher reactivity. Therefore, among the alkali metals, Caesium is the most reactive.

2. Halogens are the elements in Group 17 of the periodic table. They are Fluorine, Chlorine, Bromine, Iodine, and Astatine. These elements are also known for their high reactivity, but in this case, reactivity decreases as you move down the group. This is because as you move down the group, the outermost shell is further from the nucleus, making it harder to attract additional electrons, leading to a lower reactivity. Therefore, among the halogens, Fluorine is the most reactive.

Knowee AI · Accepted Answer

The most reactive elements of the alkali metals and halogens are Caesium and Fluorine. So, the correct answer is C. Caesium and Fluorine.

Here's why:

1. Alkali metals are the elements in Group 1 of the periodic table. They are Lithium, Sodium, Potassium, Rubidium, Caesium, and Francium. These elements are known for their high reactivity, which increases as you move down the group in the periodic table. This is because as you move down the group, the outermost electron is further from the nucleus and is therefore more easily lost, leading to a higher reactivity. Therefore, among the alkali metals, Caesium is the most reactive.

2. Halogens are the elements in Group 17 of the periodic table. They are Fluorine, Chlorine, Bromine, Iodine, and Astatine. These elements are also known for their high reactivity, but in this case, reactivity decreases as you move down the group. This is because as you move down the group, the outermost shell is further from the nucleus, making it harder to attract additional electrons, leading to a lower reactivity. Therefore, among the halogens, Fluorine is the most reactive.

Which are the most reactive elements of the alkali metals and halogens?A. Lithium and fluorineB. Lithium and iodineC. Caesium and fluorineD. Caesium and iodine

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