Periodic table and Periodicity of Properties

Question 2:Give short answers.

I. Write the valance shall electronic configuration of an element president 3rd period and group IIIA.

Answer

Period number = 3

Group number = 3

If period number = 3, it means that valence electron is present in 3rd shell. From group number =3, number of valence electrons are 3.

ii. Write two ways in which isotopes of an element differ.

iii. Which atom has higher shielding effect, Lithium or sodium?

iv. Explain why sodium has higher ionization energy than potassium?

v. Alkali metals belong to s- block in the periodic table, why?

Question 3: Arrange the elements in each of the following groups in order of increasing ionization energy.

a. Li, Na, K b. Cl, Br, I

Answer.

Question 4: In the elements in each of the following in order of decreasing shielding effect.

a. Li, Na, K b. Cl, Br, I c. Cl, Br

Answer.

Question 5. Specify each of the following elements you would expect to have the greatest electron affinity

S, P, Cl

Answer.

Question 6:

Electronic configuration of some elements are given below groups the elements and the pairs that would represent similar chemical properties.

A. 1s²,2s²

B. 1s²,2s²,2p⁶

C. 1s²,2s², 2p³

D. 1s²

E. 1s²,2s²,2p⁶,3s²,3p³

F. 1s²,2s¹

G. 1s²,2s²,2p⁶,3s¹

H. 1s²,2s²,2p⁶,3s²

Answer.

Question 7; arrange the elements and groups and period and question number six.

Answer.

Question 8: For normal elements the number of valence electrons of an element is equal to the group number. Find the group number of the following elements.

Al, S, K, O

Answer.

QQuestion9: write the valence channel electronic configuration of the following groups.

a. Alkali metals

b. Alkaline earth metals

c. Halogens

d. Noble gases

Answer

Question 10. Write electron dot symbols for an atom of the following elements.

a. Be

b. K

c. N

d. I

Question 11. Write the valence shell electronic configuration of atoms of the following elements.

A an element present in period 3 of group VA

B. An element present in period 2 of group VIA

Question 12 copy and complete the following table.

Question 13 imagine you are standing on the top of neon 20 nucleus how many kinds of subatomic particles you would see looking down into the nucleus and those you see looking out from the nucleus.

Question 14 colorine is a reactive element used to disinfect swimming pools It is made up of two eyes tops CL 35 and CL 37 because CL35 is more than the CL37 that I make mass of colouring is 35.5 AMU His course closer to 35 than 37 right electronic configuration of each as a top of the green also writes symbol for though these isotopes atomic number of 17.

Question15. And which block group and period in the periodic table where would you place each of the following elements with following electronic configuration.

a. 1s2,2s1

b. 1s2,2s2,2p5

c. 1s2,2s2,2p6,3s2

d. 1s2

Think tank

Question 1: What types of elements have the highest ionization energies and what types of elements have the lowest ionization energies argue.

Question number two two items have electronic configuration one is to it was two to be six and one is two tws to p63 as one the ionization energy of one is two zero eight zero kilogramme per mole and that of the other is four ninety six kilojoules per moon each each organisational achieve with one of the given electronic configuration give reason for your choice.

Question three use a second member of each group from group first a secondly and 70 to just that the number of various electron and anatomical element is the same as its group number.

Course the number four letter A B C D E F indicates elements in the following figure

a. Which elements are in the same periods?

b. Right whereas cell electronic configuration of element D.

c. Which elements are metal?

d. Which elements can lose two electrons?

e. In which group E is present?

f. Which of the element is halogen?

g. Which element will form dipositive cation?

h. Arrived electronic configuration of element E.

i. Which two elements can form ionic bond.

j. Can element see from C2 molecule? Interpret.

k. Which element can form co-ordinate bonds?

l. Is element have a metal or nonmetal?

Question 5: electronic configurations of four elements are given below:

a. 1s2, 2s2

b. 1s2,2s2,2p5

c. 1s2,2s2,2p6,3s2

d. 1s2

Which of these eleelementi.

I. An alkali metal

J. An alkaline earth metal

K. A noble gas

L. A halogen

Question 6. I'll go invert region of periodic table you will find elements with the relatively.

a. High ionizatio energy

b. Low ionization energy

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