Advertisements
Advertisements
प्रश्न
Find the odd one out and give its explanation.
पर्याय
Carbon
Calcium
Oxygen
Neon
Advertisements
उत्तर
Calcium
Explanation-
Calcium is a s-block element while others are p-block elements.
APPEARS IN
संबंधित प्रश्न
How does the metallic character of elements in Modern Periodic Table vary on moving from left to right in a period, and (ii) down a group?Give reason to justify your answer.
What is periodicity in properties of elements with reference to the Modern Periodic Table?
State modern periodic law.
Fill in the following blank with suitable word:
Group 18 elements are called ...............
What is meant by a period, in a periodic table?
Give two example of group 18 elements.
What is the significance of atomic number in the modern classification of elements? Explain with the help of an example.
Give alongside is a part of the periodic table :
As we move horizontally from left to right:
| Li | Be | B | C | N | O | F | |
| Na | Mg | Al | Si | P | S | Cl |
(i) What happens to the metallic character of the elements?
(ii) What happens to the atomic size?
How does the chemical reactivity of the halogens vary on going in group 17 of the periodic table?
What is the major characteristic of the first elements in the periods of the periodic table? What is the general name of such elements?
Explain why All the elements of a period have different chemical properties.
What are the merits of the modern periodic table of elements?
What are the advantages of the periodic table?
The following diagram shows a part of the periodic table in which the elements are arranged according to their atomic numbers. (The letters given here not the chemical symbols of the elements):
| a 3 |
b 4 |
c 5 |
d 6 |
e 7 |
f 8 |
g 9 |
h 10 |
|
| i 11 |
j 12 |
k 13 |
l 14 |
m 15 |
n 16 |
o 17 |
p 18 |
(i) Which element has a bigger atom, a or f?
(ii) Which element has a higher valency, k or o?
(iii) Which element is more metallic i or k?
(iv) Which element is more non-metallic, d or g?
(v) Select a latter which represents a metal of valency 2.
(vi) Select a letter which represents a non-metal of valency 2.
Name two elements in Inert gas.
Answer the following in respect of element `31/15 P `
To which group and period does it belong?
What is the main characteristic of the last element in each period of the periodic table?
An element barium has atomic number 56. Look up its position in the periodic table and answer the following question.
What will be the formula of its phosphate?
The electronic configuration of an element T is 2, 8, 8, 1.
What is the group number of T?
Name an alkali metal in period 3 and halogen in period 2.
State the modern periodic law.
What is the number of elements in the 1st period?
Answer the following question.
Define the atomic size. Give its unit of measurement. In the modern periodic table what trend is observed in the atomic radius in a group and a period and why is it so?
In the Modern Periodic Table – atoms of all elements are arranged according to their increasing order of – atomic numbers. An atom of nitrogen has seven protons and seven electrons. State what would be its atomic number.
Name the cation and the anion in the salt – calcium sulphate
Give the symbol and valency of the following element and radical.
Sodium
Give the symbol and valency of the following element and radical.
Bicarbonate
State what the group number in the Modern Periodic Table signifies. Give a reason why elements in the same group, have similar valency and similar chemical properties.
The groups 1 and 2 constitute the _______ block.
The modern periodic table has 1 to 7 periods.
Write scientific reason.
Lithium and sodium are included in the same group in periodic table.
In the modern periodic table, elements are arranged according to their ______
Which of the following elements does not lose an electron easily?
If an element X is placed in group 14, what will be the formula and the nature of bonding of its chloride?
Choose an element from period 3 of modern periodic table that matches the description given below in instance. Give a reason for your choice.
It has a similar structure to diamond.
A part of modern periodic table is given below. On its basis, answer the following questions:
| Group No. → | 1 | 2 | 13 | 14 | 15 | 16 | 17 | 18 |
| Period ↓ | ||||||||
| 2 | A | B | ||||||
| 3 | E | D | F | C |
Which of the element is a Noble gas?
Match the atomic number with the following:
A rare gas.
