A)Arrange the elements in the increasing order of the properties mentioned below.
B, C, Si, N, F [non-metallic character]
b) The first ionisation energy of Na is lesser than Mg, but the second ionisation
energy of Na is more than Mg. Explain
c) IE1 of Be is higher than B. Give reason

Non metal is an element or substance that is not a metal metal is a solid material that is typically hard, shiny, malleable, fusible, and ductile, with good electrical and thermal conductivitymetalloid is an element (e.g., germanium or silicon) whose properties are intermediate between those of metals and solid nonmetals. they are electrical semiconductors.

13) a 14) a15) b16) i don't know sorry17) a (maybe)

Heat is involved in chemical change in two ways; chemical changes either result in heat being added to or removed from an object, and chemical changes require a certain amount of heat before they can take place.