Question
The elements in group 7 are called halogens. The halogens get less reactive as you go down group 7. Predict which halogen has the most quickly with hydrogen. (Hint: use the periodic table to help you) Enteranswer
Answer
4.2
(284 Votes)
Quintina
Elite · Tutor for 8 years
Answer
Fluorine
Explanation
## Step 1:First, let's understand the question. It's asking us to predict which halogen reacts most quickly with hydrogen. The hint suggests that we should use the periodic table to help us. ## Step 2:We know that the elements in group 7 are called halogens. The reactivity of halogens decreases as we move down the group in the periodic table. This is because as we move down the group, the atoms get larger, and the outermost electrons (which are involved in the reactions) are further from the nucleus and are less strongly attracted to it. This makes it harder for the atom to gain an extra electron to achieve a stable electron configuration, hence, the reactivity decreases.## Step 3:Therefore, the halogen at the top of the group would be the most reactive, as its outermost electrons are closest to the nucleus and are more strongly attracted to it, making it easier for the atom to gain an extra electron and react.### The first halogen in the periodic table (moving from top to bottom) is Fluorine (F).