Question

elements j and k are in the same period in the periodic table. j reacts with acids to produce a salt and hydrogen. k reacts with sodium to form an ionic compound. which statement about j and k is correct? a an atom of j has more electrons than an atom of k. b j and k are both metals. c j and k are both non - metals. d j is to the left of k in the periodic table. 5. part of the periodic table is shown. which element has a high density, a high melting point and forms a brown oxide? paper - 2 theory questions 6. the periodic table can be used to classify elements. (a) group i elements react with cold water to form alkaline solutions. (i) place the group i elements caesium, lithium, potassium, rubidium and sodium in their order of reactivity with water. put the most reactive element first. most reactive → least reactive (ii) name the alkaline solution formed when caesium reacts with cold water.

Explanation:

4.

1. Since J reacts with acids to produce a salt and hydrogen, J is a metal.
2. Since K reacts with sodium to form an ionic compound, K is a non - metal.
3. In a period, metals are on the left and non - metals are on the right. So J is to the left of K in the Periodic Table.

The reactivity of Group I elements with water increases down the group.

When an alkali metal reacts with water, it forms a metal hydroxide.

Answer:

D. J is to the left of K in the Periodic Table.

6. (a) (i)