Page 31 - Chemistry ICSE Class X

Periodic Properties and Variations of Properties (Physical and Chemical) 19

Illustrative Questions

Q.1. (QT GCEJ QH VJG HQNNQYKPI ITQWRU PCOG VJG GNGOGPV YKVJ VJG EJCTCEVGTKUVKEU URGEKſGF DGNQY
Element Least electronegative Least nonmetallic
(a) F, Cl, Br — — — —
(b) Li, Na, K — — — —

Ans. Element Least electronegative Least nonmetallic
(a) F, Cl, Br Br Br
(b) Li, Na, K K K
Q.2. What do you understand by the term periodicity? Are the properties of the elements placed in a group same?
+NNWUVTCVG
Ans. 6JG TGRGVKVKQP QH UKOKNCT RTQRGTVKGU CHVGT TGIWNCT KPVGTXCNU KU ECNNGF RGTKQFKEKV[
6JG EJGOKECN RTQRGTVKGU QH VJG GNGOGPVU RNCEGF KP C ITQWR CTG UKOKNCT 6JG RJ[UKECN RTQRGTVKGU QH VJG GNGOGPVU
RNCEGF KP C ITQWR JQYGXGT UJQY C ITCFWCN EJCPIG (QT GZCORNG CNN CNMCNK OGVCNU ITQWR UJQY UKOKNCT
RTQRGTVKGU K G VJGUG GNGOGPVU CTG JKIJN[ GNGEVTQRQUKVKXG HQTO KQPKE EQORQWPFU GVE
Q.3. How do the electronic structures of the atoms relate to their position in the modern periodic table?
Ans. In the modern periodic table, the period describes the number of electronic shells in the atom, and the electrons
KP VJG QWVGTOQUV UJGNN FGPQVG VJG ITQWR 5Q VJG NQECVKQP QH CP[ GNGOGPV KP VJG RGTKQFKE VCDNG KU TGNCVGF VQ KVU
GNGEVTQPKE UVTWEVWTG

ASSIGNMENT 2

Periodicity in ionisation energy, Electron affinity, Electronegativity

ϭ͘ Ɛ ǁĞ ŐŽ ĚŽǁŶ Ă ŐƌŽƵƉ͕ ƚŚĞ ĮƌƐƚ ŝŽŶŝƐĂƟŽŶ ĞŶĞƌŐLJ ŐĞŶĞƌĂůůLJ _________________________ ;ŝŶĐƌĞĂƐĞƐ ͬĚĞĐƌĞĂƐĞƐͿ͘
Ϯ͘ dŚĞ ĞůĞĐƚƌŽŶĞŐĂƟǀŝƟĞƐ ;ďĂƐĞĚ ŽŶ WĂƵůŝŶŐΖƐ ƐĐĂůĞͿ ŽĨ ƚŚĞ ĞůĞŵĞŶƚƐ ďĞůŽŶŐŝŶŐ ƚŽ WĞƌŝŽĚ ϯ ĂƌĞ ŐŝǀĞŶ ďĞůŽǁ ǁŝƚŚ ƚŚĞ ĞůĞŵĞŶƚƐ
ĂƌƌĂŶŐĞĚ ŝŶ ƚŚĞ ĂůƉŚĂďĞƟĐĂů ŽƌĚĞƌ͘

ů ů DŐ EĂ P S ^ŝ
ϭ͘ϱ ϯ͘Ϭ ϭ͘Ϯ Ϭ͘ϵ Ϯ͘ϭ Ϯ͘ϱ ϭ͘ϴ
;ĂͿ ƌƌĂŶŐĞ ƚŚĞ ĞůĞŵĞŶƚƐ ŝŶ ƚŚĞ ŽƌĚĞƌ ƚŚĞLJ ŽĐĐƵƌ ŝŶ ƚŚĞ ƉĞƌŝŽĚŝĐ ƚĂďůĞ ĨƌŽŵ ůĞŌ ƚŽ ƌŝŐŚƚ͘
;ďͿ ŚŽŽƐĞ ƚŚĞ ǁŽƌĚͬƉŚƌĂƐĞ ĨƌŽŵ ƚŚĞ ďƌĂĐŬĞƚƐ ǁŚŝĐŚ ĐŽƌƌĞĐƟǀĞůLJ ĐŽŵƉůĞƚĞƐ ĞĂĐŚ ŽĨ ƚŚĞ ĨŽůůŽǁŝŶŐ ƐƚĂƚĞŵĞŶƚƐ͗
;ŝͿ dŚĞ ĞůĞŵĞŶƚ ďĞůŽǁ ƐŽĚŝƵŵ ŝŶ ƚŚĞ ƐĂŵĞ ŐƌŽƵƉ ǁŽƵůĚ ďĞ ĞdžƉĞĐƚĞĚ ƚŽ ŚĂǀĞ Ă _____________________
;ůŽǁĞƌͬŚŝŐŚĞƌͿ ĞůĞĐƚƌŽŶĞŐĂƟǀŝƚLJ ƚŚĂŶ ƐŽĚŝƵŵ͘
;ŝŝͿ dŚĞ ĞůĞŵĞŶƚ ĂďŽǀĞ ĐŚůŽƌŝŶĞ ǁŽƵůĚ ďĞ ĞdžƉĞĐƚĞĚ ƚŽ ŚĂǀĞ Ă _________________________ ;ůŽǁĞƌͬŚŝŐŚĞƌͿ ŝŽŶŝƐĂƟŽŶ
ĞŶĞƌŐLJ ƚŚĂŶ ĐŚůŽƌŝŶĞ͘
ϯ͘ EĂŵĞ ƚŚĞ ĨĂĐƚŽƌƐ ŽŶ ǁŚŝĐŚ ŝŽŶŝƐĂƟŽŶ ĞŶĞƌŐLJ ŽĨ ĂŶ ĞůĞŵĞŶƚ ĚĞƉĞŶĚ͘
ϰ͘ tƌŝƚĞ Ă ĐŚĞŵŝĐĂů ĞƋƵĂƟŽŶ ĚĞƐĐƌŝďŝŶŐ ƚŚĞ ĞůĞĐƚƌŽŶ ĂĸŶŝƚLJ ŽĨ ĂŶ ĞůĞŵĞŶƚ͘
ϱ͘ ;ĂͿ ĞĮŶĞ ƚŚĞ ƚĞƌŵ ĞůĞĐƚƌŽŶĞŐĂƟǀŝƚLJ͘ ;ďͿ ,Žǁ ĚŽĞƐ ĞůĞĐƚƌŽŶĞŐĂƟǀŝƚLJ ǀĂƌLJ ŝŶ Ă ƉĞƌŝŽĚ͍

Let us Answer Some More Questions

1. 5VCVG VJG OQFGTP RGTKQFKE NCY
2. 9JCV KU VJG DCUKU QH VJG ENCUUKſECVKQP QH GNGOGPVU KP VJG OQFGTP RGTKQFKE VCDNG!
3. $[ YJKEJ EQOOQP PCOG CTG VJG GNGOGPVU QH )TQWR CPF )TQWR ECNNGF!
4. Name an element which is
(a) most metallic
(b) most nonmetallic