Modern Periodic Table

Q.

$M^{+3}$ ion loses $3e^{-}$. Its oxidation number will be

1. 0

2. +3

3. +6

4. -3

Q.

What is the maximum number of electrons that can be filled in 3d subshell?

1. 14

2. 2

3. 10

4. 6

Q.

The mass numbers of three isotopes of an element are 10, 12, and 14 units. Their percentage abundance is 80, 15 and 5, respectively. What is the atomic weight of the element?

___

Q.

The maximum number of elements present in seventh period of the modern periodic table is:

1. 18

2. 32

3. 8

4. 2

Q.

Modern Periodic Table is based on atomic numbers.

1. True
2. False

Q.

The half of the distance between two atoms when they are bound together by a single bond in a covalent molecule is called "Metallic Radius”.

1. True

2. False

Q.

The second and third period of the modern periodic table contains how many elements?

1. 18

2. 32

3. 8

4. 2

Q. The IUPAC name of element with atomic number $104$ is

Q.

Who made the modern periodic table?

Q.

Who developed the long form of periodic table?

1. Lothar Meyer

2. Niels Bohr

3. Mendeleef

4. Moseley

Q.

In the periodic table, where are non-metals located:

1. Between groups IA and IIA

2. On the lower left hand side

3. On the upper right hand side

4. On the upper left hand side

Q.

State the Periodic Law on which the Modern Periodic Table is based.

Q. 47.Number of degenerate orbitals of hydrogen atom in the 4th shell is

Q.

The drawbacks of Mendeleev's Periodic Table are:

1. Position of Lanthanides and Actinides

2. All the (a) , (b) and (c)

3. Position of Hydrogen was unclear

4. Position of Isotopes

Q.

Newland arranged elements in increasing order of atomic weights and noted that every eighth element had properties similar to:

1. Third element

2. Fourth element

3. Second element

4. First element

Q. Write molecular orbital electronic configuration of Helium, Lithium, Hydrogen, C2, N2, O2 and F2. Calculate the bond order and predict the magnitude of each species?

Q. According to modern periodic law, the physical and chemical properties of the elements are periodic functions of

Q.

The number of shells in the elements of the 3rd period is.

1. 1

2. 2

3. 3

4. 0

Q. Without consulting the periodic table, select from each of the following sets, the elements belonging to the same group of the periodic table

1. Z=12, 38, 4, 88

2. Z=31, 13, 81, 50

3. Z=21, 39, 90, 57

4. Z=11, 3, 20, 37

Q.

The phrase "periodicity in the properties of elements” means that when elements are arranged in the increasing order of their atomic numbers, similar elements

1. Form horizontal rows

2. Recur after a fixed interval

3. Recur after certain regular interval

4. Form vertical groups

Q.

The noble gases are

1. Polyatomic

2. Diatomic

3. Monoatomic

4. Triatomic

Q.

Why do the melting points of group 2 elements not show regular trends?

1. Atoms have large ionic radii

2. Atoms of elements have smaller size

3. Atoms adopt different crystal structures

4. Atoms have high nuclear charges

Q.

The atomic number of other elements which lie in the same group as the tenth element in the periodic table are

1. 2, 18, 30, 36

2. 8, 18, 36, 84

3. 2, 18, 36, 54

4. 18, 32, 54, 86

Q.

An element having configuration 1s²2s²2p⁶3s²3p⁶4s¹ will form:

1. Acidic oxide

2. Amphoteric oxide

3. Basic oxide

4. Neutral oxide

Q. Order of negative electron gain enthalpy of group 16 elements

Q. which elements have positive electron gain enthalpy? Is electron gain enthalpy of phosphorus positive

Q.

Germanium is a:

1. Metalloid

2. Non-metal

3. Metal

4. Insulator

Q. in multi-electron atom 4s-orbital is lower in energy than 1)3d-orbital 2)3p-orbital 3)2s-orbital 4)2p-orbital

Q.

What does actinide mean?

Q. \sqrt{\mathcal v} of x-rays is plotted against atomic number in Moseleys experiment. The slope of the plot is (\mathcal v=frequency) (1) \mathcal v (2) a (3) ab (4) b