In the carbon family the melting points of the elements decrease on descending the group because the interatomic bonds become

The melting point of NaCl is high because:-

State how density and melting points of elements varies across a period and down a group.

In high altitudes, the boiling point of water decreases because

Boron has an extremely high melting point because of

Boron has an extremely high melting point because of

Solubility of alkaline earth metal sulphates decreases down the group 2 because

With reference to group 1 [IA] of the periodic table - fill in the blanks with the correct word: The elements are _____ [light/heavy]. __________[metals/non-metals] since their atomic size is _______ [large/small]. The energy binding the atoms is ______ [high/low] and hence the elements have [high/low] melting points. The melting points of the elements ______ [increases/decreases] down the subgroup. The electropositive character._______ [increases/decreases] down the subgroup and the elements are strong _______ [reducing/oxidizing] agents. The element with electronic configuration 2,8,1 will have _______ [higher/lower] electronaffinity and _______ [smaller/larger] atomic size than the element with electronic configuration 2,1.

(a) Electropositive nature of the element(s) increases down the group and decreases across the period (b) Electronegativity of the element decreases down the group and increases across the period (c) Atomic size increase down the group and decreases across a period (left to right) (d) Metallic character increases down the group and decreases across a period On the basis of the above trends of the periodic table, answer the following about the electron with atomic number 3 to 9 (a) Name the most electropositive element among them (b) Name the most electronegative element (c) Name of the element with smallest atomic size (d) Name the element which is a metalloid (e) Name the element which shows maximum valency.

Why do the melting points decrease in going from NaF to Nal?

The solubility of most of the alkali metal halides except those of ___ decreases on descending the group.