(a) Complete the table to show the composition and identity of some atoms and ions. name of element nucleon number atomic number number of protons number of neutrons number of electrons overall charge --- --- --- --- --- --- --- boron 10 5 0 nitrogen 8 10 208 82 82 80 3 3 +1 (b) The fifth to eighth ionisation energies of three elements in the third period of the Periodic Table are given. The symbols used for reference are not the actual symbols of the elements. ionisation…

Chemistry 9701/22 — May/June 2016

Cambridge AS Level · AS Level Structured Questions · worked solutions for every part, with the mark scheme

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Topics Atoms, Molecules and Stoichiometry · Introduction to Organic Chemistry · Atomic Structure · Chemical Energetics · Chemical Bonding · Group 17 · +7 more

Q1Atomic StructureAtoms, Molecules and StoichiometryFree sample

(a)

Complete the table to show the composition and identity of some atoms and ions.

name of element	nucleon number	atomic number	number of protons	number of neutrons	number of electrons	overall charge
boron	10	5				0
nitrogen				8	10
	208	82	82		80
			3	3		+1

(b)

The fifth to eighth ionisation energies of three elements in the third period of the Periodic Table are given. The symbols used for reference are not the actual symbols of the elements.

	ionisation energies, $\text{kJ mol}^{-1}$
	fifth	sixth	seventh	eighth
X	7012	8496	27107	31671
Y	6542	9362	11018	33606
Z	7238	8781	11996	13842

(i)

State and explain the group number of element Y.

group number ...............................

explanation .........................................................................................................................

(ii)

State and explain the general trend in first ionisation energies across the third period.

(iii)

Complete the electronic configuration of element X.

$1s^2$ .................................................................................................................................

(c)

A sample of oxygen exists as a mixture of three isotopes. Information about two of these isotopes is given in the table.

mass number	16	17
abundance	99.76%	0.04%

(i)

Calculate the abundance of the third isotope.

(ii)

The relative atomic mass of this sample of oxygen is 16.0044.

Calculate the mass number of the third isotope. You must show your working.

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