Modern Periodic Table

Q.

How many groups and periods are there in the modern periodic table? How do the atomic size and metallic character of elements vary as we move : (i) down a group and (ii) from left to right in a period.

Q.

What were the limitations of Newland’s Law of Octaves? [3 MARKS]

Q. Which group does silicon belong to in the modern periodic table?

1. 14
2. 15
3. 16
4. 13

Q.

What is the name of 120 element?

Q.

Physical properties are those which can be observed or measured without changing the composition of matter. They are used to observe and describe matter.

1. True
2. False

Q.

What is element 140?

Q.

An element has the atomic number $115$. where will you place this element in the modern periodic table?

Q.

How many groups and periods are present in the modern periodic table?

Q. Which of the following pairs represent variable valency?

1. Calcium and iron
2. Aluminium and copper
3. Carbon and calcium
4. Iron and copper

Q.

Which of the following is not a non-metal?

1. Carbon

2. Sodium

3. Nitrogen

4. Hydrogen

Q.

The vertical columns of the periodic table are called

1. rows

2. groups

3. periods

4. colums

Q.

What is the principle behind the construction of long form of periodic table?

1. Atomic mass

2. Atomic number

3. Atomic size

4. Metallic & non-metallic character

Q.

According to Mosley, a straight line graph is obtained on plotting

1. The frequencies of characteristic X-rays of the elements against their atomic numbers.

2. The square of the frequencies of the characteristic X-rays of elements against their atomic numbers

3. The square root of the frequencies of the characteristic X-rays of elements against their atomic numbers.

4. The reciprocal of the frequencies or characteristic X-rays of elements against their atomic numbers.

Q. The total number of elements known are:

1. 92
2. 117
3. 100
4. 118

Q. Give two examples of Alloy.

Q.

What are the drawbacks of Newland’s law of octaves?

(A) The law of octaves was found to be applicable for elements with higher atomic masses.

(B) The position of hydrogen was not justifiable.

(C) Some unlike elements were placed in the same group.

1. A only
2. C only
3. A, B, C
4. A, B

Q. The Swedish scientist was the first one to introduce letters to symbolize elements.

1. Ernest Rutherford
2. John Dalton
3. J.J. Berzelius

Q.

What is a method to indicate reactants and products of a chemical reaction using chemical formulae?

1. Periodic table

2. Chemical equilibria

3. Chemical equation

4. Chemical balance

Q.

Which of the following is not a non-metal?

1. Carbon

2. Sodium

3. Hydrogen

4. Nitrogen

Q. Identify the metalloid from the following:​

1. Germanium
2. Sodium
3. Chlorine​
4. Argon

Q. State the information obtained from the chemical formula of a compound.