Revision - PPQs on the periodic table

What three elements can form hydrogen bonds with other suitable molecules when they are in a molecule?

F, O, N

How do you tell which group something is in from its successive ionisation energy?

When there is a sudden, LARGE jump upwards in the value of ionisation energy, this is when the electrons are been lost from the next shell (closer to the nucleus). The number of ionisation energies before this jump is the number of e- in the elements outer shell e.g. if there are 2 close values before a much larger value, the element is in group 2

What element is solid at RTP and has a simple molecular lattice structure?

S, P

What are two elements that contain 5 unpaired electrons?

Cr, Mn

What is the element in period three that exists in the solid state as a network of atoms bonded by strong covalent bonds?

Si

What element forms octahedral molecules with flourine?

S

What element forms trigonal planer molecules with flourine?

B

What element forms 1- ions most readily?

F

What element has the highest first ionisation energy?

He

What is the most reactive element?

F

What is the most electronegative element on the periodic table?

F

What element has an average atomic mass of 1.244 x10^-22 g?

As

Which element has the largest third ionisation energy?

Li

Which statement best explains the trend in bp down the halogens?

A Bond enthalpy of covalent bonds increases

B Become less electronegative

C London forces become stronger

D Reactivity decreases

C