Question

1). Consider an element whose outer most electron configuration is 3d^10,4S² and 4P^x.
a) to which block does the element belong?.
b)if it is a non metal, what is the value of x?.
c)identify to which block are the hardest, densest metal found?.

2). The ions of Na+ and Mg²+ occur in chemical compounds but the ions Mg³+ and Na²+ ion of.explain why this is so.

3). The following are properties of substances. Decide whether each is a physical property or chemical property.
a). Chlorine gas liquidifies at -35°C under Normal pressure.
b). Bromine freezes at -72°C.
c). Hydrogen burns in chlorine gas.
d). Lithium is a soft silvery coloured metal.

Define the following terms.
a). Physical change.
b). Chemical property.
c).homologous Substance

Answer 1

Answer:

1-element belongs to P-block

2-the value of x is 5 if the element is non metal