Trend in Electronegativity

Q.

Arrange the following as per instructions given in the brackets.

(a) Mg. Cl, Na, S, Si (decreasing order of atomic size)

(b) Cs, Na, Li, K, Rb (increasing metallic character)

(c) Na, K, Cl, S, Si (increasing ionisation potential)

(d) Cl, F, Br, I (increasing electron affinity)

(e) Cs, Na, Li, K, Rb (decreasing electronegativity)

Q. In a BCC unit cell, if half of the atoms per unit cellare removed, then percentage void is(2) 32%(1) 68%(4) 66%34%(3)

Q.

Chlorine in the Periodic Table is surrounded by the elements with atomic number 9, 16, 18 and 35.

(a) Which of these have Physical and Chemical properties resembling chlorine ?

(b) Which is more electronegative than chlorine ?

Q. The properties of elements are periodic function of thier atomic number.justify(5).

Q.

An element X has mass number 35 and the number of neutrons is 18. Identify the group number and period of X.

Q.

Name the metals and non- metals

Q. What is shielding effect?
How is it related to periodic table?

Q.

The halogen which exists as solid at room temperature is ___ .

Q.

The electronegativity of following elements increases in the order of?

Si, P, C, N.

Q. Arrange the following elements in decreasing order of electronegativity.

1. Oxygen (O)
2. Nitrogen (N)
3. Fluorine (F)
4. Carbon (C)

Q.

Choose the words which correctly completes the following statements:

The element below sodium in the same Group would be expected to have a (A) electronegativity than sodium and the element above chlorine would be expected to have a (B) ionization potential than chlorine.

Q.

Generally the ionization enthalpy in a period increases but there are some exceptions, the one which is not an exception is?

1. Be and B

2. N and O

3. Mg and Al

4. Na and Mg

Q.

The electronegativities (according to Pauling) of the elements in Period 3 of the Periodic Table asfollow with the elements arranged in alphabetical order :

$\begin{array}{ccccccc}Al& Cl& Mg& Na& P& S& Si\\ 1.5& 3.0& 1.2& 0.9& 2.1& 2.5& 1.8\end{array}$

Arrange the elements in the order in which they occur in the Periodic Table from left to right.

(The group 1 element first , followed by the group 2 element and so on , up to group 7).

Q.

The f-block elements are called as ______________.

Q.

Chlorine in the Periodic Table is surrounded by the elements with atomic number 9, 16, 18 and 35.

(a) Which of these have Physical and Chemical properties resembling chlorine ?

(b) Which is more electronegative than chlorine ?

Q.

What would have happened if electron fell into the nucleus of an atom

Q.

What are the four types of crystalline solids?

Q. 35. Among the following which one is not paramagnetic?(Atomic no. Be=4, Ne=10, As=33, Cl=17) (1) Ne2+ (2) Be+ (3) Cl- (4) As+

Q. 18. Energy required for ionization of 0.02 gram atom of magnesium is x kJ. The amount of energy required to ionise 1 atoom of magnesium is 1) x kJ 2) x / (0.02 * NA) J 3) (x*1000 ) / (0.02 * NA) J 4) x NA J

Q. In general, electronegativity ___ while going left to right across a row in the periodic table.

1. decreases
2. increases
3. remains constant
4. decreases and then increases

Q. Explain why third period has eight and not eighteen elements

Q. Choose the incorrect statement regarding ionization energy.

1. Ionization energy increases down a group.
2. Ionization energy increases along a period.
3. Ionization energy is the amount of energy required to remove a single electron from a single atom.
4. The sodium atom has lower ionization energy than chlorine atom.

Q. The last electron of group 13 -18 elements lies in _______ subshell.

1. p
2. f
3. d
4. s

Q. Which of the following metals will not react with oxygen, even when heated very strongly in the air?

1. Al
2. Ag
3. Zn
4. Fe

Q. What is ionization energy ?

Q. Explain why alkyl groups act as electron donors when attached to a pi system

Q. Which of the following elements has the least atomic radius?

1. Sodium
2. Calcium
3. Magnesium
4. Potassium

Q.

The correct order regarding the electronegativity of hybrid orbitals of carbon is?

1. sp<sp²<sp³

2. sp<sp²> sp³

3. sp>sp²<sp³

4. sp>sp²>sp³

Q.

Arrange F, Cl, O, and N in the decreasing order of electronegativity.

1. F > N > Cl > O

2. Cl > F > N > O

3. F > O > N > Cl

4. O > F > N > Cl

Q.

name the element which has high ionization potential?