Review

Periodicity………..

ALKALINE

ALKALINE EARTH

TRANSITION

ELEMENTS

HALOGENS

NOBLE

GASES

LANTHANIDE SERIES

ACTINIDE SERIES

How properties are linked to the size of the atom..Smaller the atom……..

Electrons are closer to the nucleus….

Nuclear hold is strong….

Difficult to remove electrons from it, so Ionization Energy is high…

Easy to add electrons to it, so Electronegativity is high…

They are better Non Metal

but poor Metals

How properties are linked to the size of the atom..

Larger the atom……..

Electrons are far from the nucleus….

Nuclear hold is weak….

Easy to remove electrons from it, so Ionization Energy is low…

Difficult to add electrons to it, so Electronegativity is low…

They are better Metal

but poor Non metals

Atomic size (Radius)

D…E…C…R…E…A…S…I…N…G

I

N

C

R

E

A

S

I

N

G

Ionization Energy

I…N…C…R…E…A…S…I…N…G

D

E

C

R

E

A

S

I

N

G

Electronegativity

I…N…C…R…E…A…S…I…N…G

D

E

C

R

E

A

S

I

N

G

Metallic Character

D…E…C…R…E…A…S…I…N…G

I

N

C

R

E

A

S

I

N

G

Non-Metallic Character

I…N…C…R…E…A…S…I…N…G

D

E

C

R

E

A

S

I

N

G

Review

1. The number of valence electrons in Gr IIIA elements are……………

Ans: 3

2. There are few electrons in the valence energy level of _________ and they are ___________held.

(Metals/Nonmetals) (weakly/strongly)

3. Metals tend to _______electrons whereas Nonmetals tend to _______ electrons.

Ans: lose/gain

Ans: Metals/weakly

Review…..

4. The special name of

(i) Gr I A

(ii) Gr II A

(iii) Gr VII A

(iv) Gr VIII A

(v) d block elements

(vi) 4f block elements

(vii) 5f block elements

Ans: Alkali

Ans: Alkaline earth

Ans: Halogens

Ans: Noble gas

Ans: Transition Metals

Ans: Lanthanide series

Ans: Actinide series

Review…….

5. Give one element that resembles most to “N” in phy. & Chem. Properties . Ans: P, AS, Se

6. The # of valence electrons of elements with E.C 3S2,3p5

Ans: 7

7. What charge do the following group elements form?

Gr IA , Gr VA, Gr VIIA Ans: +1, -3, -1

8. What charge do the following elements carry?

Ba , Al, P, O , Cu Ans: +2, +3, -3, -2, +2

Review…….

9. The tendency of an atom attracting electrons is called……… Ans: Electronegativity

10.Which element has the Highest E.N.?

Rb, I , In, Sr Ans: I

11. Which element has the Lowest E.N.?

As, Sb, N, P Ans: Sb

12.The nonmetal that is a liquid at room temperature…

Ans: Br

Review…………..

12.A Metal that is a liquid at room temperature…

Ans: Hg

13.Name an element that is a gas room temperature and become -1 charge? Ans: F or Cl

15. Which element has the least Ionization Energy?

P, Mg, S, Cl Ans: Mg

14.The energy required to remove an electron from an atom is called………

Ans: Ionization energy

Review……..

16. Which element has the most Ionization Energy?

Te, S, O, Se Ans: O

17.The vertical columns is called a ________ whereas the horizontal row is called a __________.

Ans: Group/family : period/series

18.Which element has the largest size?

Be , Ca, As, Br Ans: Ca19.Which element is most reactive?

N, F, P, Cl Ans: F

Review……….

20. Which element is most reactive?

K , Cs, Sc, Ba Ans: Cs

21.A Cation (positive ion) is __________ than the its atom whereas an anion is __________ than its atom.

Ans: smaller/larger22.Which one is larger?

(i)Ba or Ba+2

(ii)F or I

(iii)O-2 or O

Ans: Ba

Ans: I

Ans: O-2

Review………

23.What is the element that has 4p3 as the last piece of electron configuration? Ans: As

24.From which sublevel the electron is lost when Na becomes Na+1 ion? Ans: 3s

25.Which elements chemically resembles the most?

Ca, Ge, Se, O Ans: Se & O

26. The elements with the properties of metals and nonmetals are…… Ans: Metalloids

Review……

26.The modern periodic law is…..

Ans: The Phy. & Che. Properties of elements are periodic functions of their atomic number.

27.The tendency to lose electrons ___________ when you go down the group. Ans: increases

28. Which of the following elements is the most (i) Metallic and (ii) Nonmetallic?

Mn, Rb, Mg, Si, Cl, I, Ge Ans: (i) Rb (ii) Cl

29. Indicate whether the following elements are solids, liquids or a gases at room temperature?

K, Hg, O, Br, Cu

30.Arrange Ca, Ba, As & Ga in the order of A.S.?

31.Arrange C, O, Li & Cs in the order of I.E?