Question

Complete the information below using the online periodic tables provided in the procedure.

Element	Atomic Number	Effective Nuclear Charge	1st Ionization Energies (kJ/mol)	Atomic Radius2 (pm)	Electro- negativity Values3	Density of solid4 (kg/m3)	Number of stable isotopes
H	1	N/a	1312	37	2.2	88
He	2	N/a	2372		N/a
Li	3	1.69	520		0.98
Be	4		900
B	5		801	82		2460	2
C	6		1087	77		2267	3
N	7	3.83		75	3.04
O	8	4.45			3.44
F	9				3.98
Ne	10			69	N/A	1444	3
Na	11	2.51		154		968
Mg	12					1738
Al	13
Si	14	4.29		111	1.90
P	15	4.89		106	2.19		1
S	16	5.48					4
Cl	17					2030
Ar	18				N/A
K	19	3.50		196
Ca	20	4.40		174		1550	6

2 1 Angstrom = 100 pm; Covalent Atomic Radius taken from http://environmentalchemistry.com

3 Taken from http://environmentalchemistry.com or use Pauling Electronegativites

4   The preferred units are kg m-3 because the basic SI unit of weight is the kilogram (kg) and the preferred unit of length is the meter (m). To convert to the commonly used units of g cm-3, divide by 1000.

2 1 Angstrom = 100 pm; Covalent Atomic Radius taken from http://environmentalchemistry.com

3 Taken from http://environmentalchemistry.com or use Pauling Electronegativites

4   The preferred units are kg m-3 because the basic SI unit of weight is the kilogram (kg) and the preferred unit of length is the meter (m). To convert to the commonly used units of g cm-3, divide by 1000.

6     Fill in the data for Table 14.2 and create the following graphs and explain the pattern in each graph and how it relates to the Periodic Table.

First - the atomic numbers versus the Effective nuclear charge,

Second, the atomic numbers versus the 1st ionization energies,

Third – – the atomic numbers versus the Atomic radius, and

Fourth - – the atomic numbers versus the electronegativity values.

Answer 1

Element	Atomic No.	Effective Nuclear Charge	1st Ionisation Energy (Kj/mole)	Atomic Radius	Electro negativity	Density	No.of Stable Isotopes
H	1	N/A	1312	37	2.2	88	2
He	2	N/A	2372	49	n/a	178	2
Li	3	1.69	520	123	0.98	534	2
Be	4	1.95	900	89	1.57	1848	1
B	5	2.6	801	82	2.04	2460	2
C	6	3.25	1087	77	2.55	2267	3
N	7	3.83	1403	75	3.04	1250	2
O	8	4.45	1410	74	3.44	1429	3
F	9	5.2	1681	72	3.98	1696	1
Ne	10	5.85	2080	69	n/a	1444	3
Na	11	2.51	496	154	0.93	968	1
Mg	12	2.85	737	136	1.31	1738	3
Al	13	3.5	577	125	1.61	2702	1
Si	14	4.29	786	111	1.9	2330	3
P	15	4.89	1012	106	2.19	1820	1
S	16	5.48	999	104	2.58	2070	4
Cl	17	6.1	1255	99	3.16	2030	2
Ar	18	6.75	1521	88	n/a	1782	3
K	19	3.5	419	196	0.82	862	2
Ca	20	4.4	590	174	1	1550	6