Trends in Modern Periodic Table

Q.

By drawing an electron dot diagram, show the lone pair effect leading to the formation of ammonium ion from ammonia gas and hydrogen ion.

Q.

Name the most reactive element.

Q.

__ law states that the physical and chemical properties of elements are periodic function of their atomic numbers.

Q.

Arrange S, O and Se in the ascending order of electron affinity.

1. Se < O < S

2. S < O < Se

3. S < Se < O

4. Se < S < O

Q.

The energy required to remove an electron from an isolated gaseous atom is called __ energy.

Q. Ammonia is acidic in nature.

1. True
2. False

Q.

The atomic number of A is 17. Name the element A and state whether A is a metal or non- metal.

Q.

Fill in the following blanks with suitable words :

(a) The basis for the modern periodic table is ……………

(b) The horizontal rows in a periodic table are called ……………

(c) Group 1 elements are called ………………

(d) Group 17 elements are known as ……………

(e) Group 18 elements are called ……………

(f) According to Newland’s classification of elements, the properties of sulphur are similar to those of oxygen because sulphur is the …………… element starting from oxygen.

Q. 53. difference in atomic radius is maximum for(a) Rb-Cs(b) K-Rb(c)Na-K(d) Li-Na Explain with reason

Q.

The energy required to remove an electron from an isolated gaseous atom is called __.

Q. Which of the following is the electronic configuration of the outer most two subshells of the alkali metals

1. 
2. 
3. 
4. 

Q. State modern periodic laws.

Q. Question 48 (a)
(a) Electropositive nature of the element(s) increases down the group and decreases across the period
(b) Electronegativity of the element decreases down the group and increases across the period
(c) Atomic size increases down the group and decreases across a period (left to right)
(d) Metallic character increases down the group and decreases across a period.
On the basis of the above trends of the Periodic Table, answer the following about the elements with atomic numbers 3 to 9.

Name the most electropositive element among them

Q. Element X is the first element of alkaline earth metals family. An element Y is the first element of alkali metals family. An element Z is the first element of the halogen family. Among the three elements which one has a larger atomic size?

1. Element X
2. Element Y
3. Element Z
4. All three have the same size

Q.

Element X is a metal with a valency 2. Element Y is a non-metal with a valency 3.
(a) Write equations to show how X and Y form ions.
(b) If Y is a diatomic gas, write the equation for the direct combination of X and Y to form a compound.

Q.

Comment: “Non-metals are electronegative elements.”

Q.

Name of the following

A liquid metal

Q. Question 48 (b)
(a) Electropositive nature of the element(s) increases down the group and decreases across the period
(b) Electronegativity of the element decreases down the group and increases across the period
(c) Atomic size increases down the group and decreases across a period (left to right)
(d) Metallic character increases down the group and decreases across a period.
On the basis of the above trends of the Periodic Table, answer the following about the elements with atomic numbers 3 to 9.

Name the most electronegative element.

Q. The correct order of atomic radii in group 13 elements?

Q.

Name the properties of the elements which,

Increase in going from left to right in a period

Q.

Give one word for the following:

The process by which a particle gains or loses electrons.

Q.

state in short -modern periodic table

Q.

Name a non-metallic element found in (i) liquid state (ii) gaseous state

Q. The energy required to remove the valence electrons of an isolated gaseous atom is called ionization energy.

1. True
2. False

Q.

hello, my self saloni i have i doubt for converting word equation to formula equation.

i want to know what things i should know or learn for this. i have already learned valancy of first 20 elements, names and symbol of some ions.

Q.

An element belongs to IIIA group and forth period in the modern periodic table. What could be the probable atomic number of that element?

1. 23

2. 49

3. 31

4. 13

Q. 33.Arrange these in correct order of atomic radius with reason K ; K+ ; Sr; Sr2+

Q.

Why does sodium have a higher ionization energy compared to pottassium

Q. What do you mean by valence electrons? Find out the number of valence electrons in carbon, hydrogen, and oxygen.

Q. The size of atoms in any group shows a regular increase, the reason being as we go down any group:

1. The charge on the nucleus regulaly increases
2. Electrons are added to new shells
3. Electronegativity regularly decreases
4. The metallic character of the elements regularly increases