elements x and y are from group 7 in the periodic table. x is a liquid at rtp, while y is a solid at rtp. which statements are correct?
1) atoms of y have more protons than atoms of x
2) molecules of y have more atoms than molecules of x
3) y displaces x from aqueous solutions of x ions.
i know that 3 is definitely wrong. And since all the elements in group 7 are fluorine, chlorine, bromine etc etc, and their molecules are Cl2, Br2, F2 etc, so option 2 is also wrong, because their molecules should all have 2 atoms right? So i think the statement that is correct is only 1. But, then correct answer is 2! I don't understand! Please help!
I agree that statement 1 is correct and the other two are not true.
To determine whether statements 1, 2, and 3 are correct, let's analyze each statement:
1) "Atoms of y have more protons than atoms of x":
This statement is incorrect. Elements in group 7 of the periodic table, also known as Group 17 or the halogens, have the same number of valence electrons. Valence electrons determine an element's chemical behavior. Therefore, elements in the same group have similar chemical properties, including having the same number of protons. Thus, the number of protons in atoms of both x and y is the same.
2) "Molecules of y have more atoms than molecules of x":
This statement is incorrect. In group 7 of the periodic table, the elements form diatomic molecules. This means that their molecules consist of two atoms of the same element bonded together. Therefore, both x and y have molecules with two atoms. Hence, the number of atoms in the molecules of x and y is the same.
3) "Y displaces x from aqueous solutions of x ions":
This statement is correct. The reactivity of the halogens, which are elements in group 7 of the periodic table, decreases as you move down the group. This means that the higher the element is in the group, the more reactive it is. Since y is higher in the group than x, it is more reactive. Therefore, it can displace x from aqueous solutions of x ions.
So, the correct answer is statement 3. The fact that y is a solid at room temperature and x is a liquid at room temperature does not affect the correctness of the statements.