Page 20 - Chemistry ICSE Class X

8 ICSE Chemistry – 10
Explanation: Nonmetallic character of an element is related to its
VGPFGPE[ VQ CEEGRV ICKP GNGEVTQP 6JG VGPFGPE[ VQ ICKP GNGEVTQPU FGETGCUGU
YKVJ CP KPETGCUG KP VJG CVQOKE UK\G 6JGTGHQTG VJG PQPOGVCNNKE EJCTCEVGT QH
GNGOGPVU KP C ITQWR FGETGCUGU FQYP VJG ITQWR
How does nonmetallic character vary in a period

Nonmetallic character increases in going from left to right in a period.
Therefore, the elements on the right side of the periodic table are
nonmetals.
Explanation: Across a period (from left to right), the tendency to gain
electrons increases due to the increase in the nuclear charge and decrease
KP CVQOKE UK\G #U C TGUWNV VJG PQPOGVCNNKE EJCTCEVGT KPETGCUGU KP IQKPI
HTQO NGHV VQ TKIJV KP C RGTKQF

Period 2 Li Be B C N O F
Period 3 Na Mg Al Si P S Cl
metallic character decreases
Metals o Nonmetals
nonmetallic character increases
ASSIGNMENT 1

Periodicity in properties, Atomic size, Metallic character, Nonmetallic character

ϭ͘ 'ŝǀĞŶ ďĞůŽǁ ĂƌĞ ƐŽŵĞ ŽĨ ƚŚĞ ĞůĞŵĞŶƚƐ ǁŝƚŚ ƚŚĞŝƌ ĂƚŽŵŝĐ ƐŝnjĞƐ͘

ůĞŵĞŶƚ ^ŝ P EĂ ů Mg S ů
ƚŽŵŝĐ ƐŝnjĞͬƉŵ ϭϭϳ ϭϭϬ ϭϱϳ 99 ϭϯϲ ϭϬϰ ϭϮϱ
/ŶĨĞƌ ŚŽǁ ĚŽĞƐ ƚŚĞ ĂƚŽŵŝĐ ƐŝnjĞ ŽĨ ĞůĞŵĞŶƚƐ ǀĂƌLJ ĨƌŽŵ ůĞŌ ƚŽ ƌŝŐŚƚ ŝŶ Ă ƉĞƌŝŽĚ ŽĨ ƚŚĞ ƉĞƌŝŽĚŝĐ ƚĂďůĞ͘
Ϯ͘ 'ŝǀĞŶ ĂůŽŶŐƐŝĚĞ ĂƌĞ ƚŚĞ ŵĞůƟŶŐ ƉŽŝŶƚƐ ĂŶĚ ĂƚŽŵŝĐ ƌĂĚŝŝ ŽĨ ƚŚĞ
ůĞŵĞŶƚ X Y Z
ĞůĞŵĞŶƚƐ y͕ z ĂŶĚ ͕ ĞĂĐŚ ŚĂǀŝŶŐ N ĞůĞĐƚƌŽŶƐ ŝŶ ŝƚƐ ŽƵƚĞƌŵŽƐƚ
ƐŚĞůů͘ DĞůƟŶŐ ƉŽŝŶƚͬΣ ϭϴϬ ϵϳ ϲϯ
;ĂͿ Ž ƚŚĞƐĞ ĞůĞŵĞŶƚƐ ďĞůŽŶŐ ƚŽ ƚŚĞ ƐĂŵĞ ŐƌŽƵƉ Žƌ ƚŽ ƚŚĞ ƐĂŵĞ ƚŽŵŝĐ ƌĂĚŝƵƐͬƉŵ ϭϮϯ ϭϱϳ ϮϬϮ
ƉĞƌŝŽĚ͍
;ďͿ tŚŝĐŚ ĞůĞŵĞŶƚ ǁŝůů ďĞ ƚŚĞ ůĞĂƐƚ ŵĞƚĂůůŝĐ͍
ϯ͘ 'ŝǀĞŶ ĂůŽŶŐƐŝĚĞ ŝƐ Ă ƉĂƌƚ ŽĨ ƚŚĞ ƉĞƌŝŽĚŝĐ ƚĂďůĞ͘ ƌƌĂŶŐĞ ƚŚĞ ŐŝǀĞŶ ĞůĞŵĞŶƚƐ Be
;ĂͿ /Ŷ ƚŚĞ ŽƌĚĞƌ ŽĨ ĚĞĐƌĞĂƐŝŶŐ ĂƚŽŵŝĐ ƐŝnjĞ ŝŶ ƚŚĞ EĂ Mg ůപ^ŝപWപ^പ ů Ar
WĞƌŝŽĚ ________________________________________ Ă
'ƌŽƵƉ ________________________________________ Sr
Ă
;ďͿ /Ŷ ƚŚĞ ŽƌĚĞƌ ŽĨ ŝŶĐƌĞĂƐŝŶŐ ŵĞƚĂůůŝĐ ĐŚĂƌĂĐƚĞƌ ŝŶ ƚŚĞ
WĞƌŝŽĚ ________________________________________
'ƌŽƵƉ ________________________________________
;ĐͿ /Ŷ ƚŚĞ ŽƌĚĞƌ ŽĨ ŝŶĐƌĞĂƐŝŶŐ ĞůĞĐƚƌŽŶĞŐĂƟǀŝƚLJ ŝŶ ƚŚĞ
WĞƌŝŽĚ ________________________________________
'ƌŽƵƉ ________________________________________
ϰ͘ /Ŷ ǁŚŝĐŚ ƉĂƌƚ ŽĨ Ă ŐƌŽƵƉ ǁŽƵůĚ LJŽƵ ĞdžƉĞĐƚ ƚŚĞ ĞůĞŵĞŶƚƐ ƚŽ ŚĂǀĞ
;ĂͿ ƚŚĞ ŵŽƐƚ ŵĞƚĂůůŝĐ ĐŚĂƌĂĐƚĞƌ ;ďͿ ƚŚĞ ůĂƌŐĞƐƚ ĂƚŽŵŝĐ ƐŝnjĞ͍
ϱ͘ Ŷ ĞůĞŵĞŶƚ y ůŝĞƐ ŝŶ ƚŚŝƌĚ ƉĞƌŝŽĚ ĂŶĚ ŐƌŽƵƉ ϭϳ͘ &ŝŶĚ ŽƵƚ
;ĂͿ ƚŚĞ ŶƵŵďĞƌ ŽĨ ǀĂůĞŶĐĞ ĞůĞĐƚƌŽŶƐ ŝŶ ŝƚƐ ĂƚŽŵ ;ďͿ ǀĂůĞŶĐLJ ŽĨ ƚŚĞ ĞůĞŵĞŶƚ y
;ĐͿ ŶĂƚƵƌĞ ʹ ŵĞƚĂůůŝĐ Žƌ ŶŽŶŵĞƚĂůůŝĐ ;ĚͿ ŶĂŵĞ ŽĨ ƚŚĞ ĞůĞŵĞŶƚ͘
ϲ͘ 'ŝǀĞŶ ďĞůŽǁ ŝƐ Ă ůŝƐƚ ŽĨ ĞůĞŵĞŶƚƐ͗
^ŽĚŝƵŵ͕ WŽƚĂƐƐŝƵŵ͕ DĂŐŶĞƐŝƵŵ͕ ^ŝůŝĐŽŶ͕ >ŝƚŚŝƵŵ͕ WŚŽƐƉŚŽƌƵƐ͕
ĞƐŝƵŵ͕ ƌŐŽŶ͕ ŚůŽƌŝŶĞ͕ ůƵŵŝŶŝƵŵ͕ ZƵďŝĚŝƵŵ͕ &ƌĂŶĐŝƵŵ