Periodic classification of elements Worksheet-2

Periodic classification of elements Worksheet-2

 

  1. All the elements in a group in the periodic table have the same____.

A. Atomic number

B. Electronic configuration

C. Atomic weight

D. Number of electrons in the outermost shell or valence electrons

 

  1. The most predominantly ionic compounds will be obtained from the combination of elements belonging to _____.

A. 1 and 7 groups                          B. 2 and 6 groups

C. 3 and 5 groups                         D. 0 and 7 groups

 

  1. Which metal has 2 electrons in the outermost orbit?

A. Na                  B. Cu                   C. Au                   D. Be

 

  1. The elements on the right side of the periodic table are____.

A. Metals                                        B. Metalloids

C. Non-metals                               D. Transition elements

 

  1. In third row of periodic table the atomic radii from Na to Cl ____.

A. Continuosly decreases

B. Continuosly increases

C. Remains constant

D. Increases but not continuously

 

  1. On moving down a group of regular elements, atomic radii increases with increasing

A. Atomic number                       B. Atomic weight

C. Atomic mass                             D. None of these

 

  1. Which among the following indicates the correct order of atomic size?

A. Be > F > C > Ne                       B. Be < C < F < Ne

C. Be > C > F > Ne                       D. F < Ne < Be < C

 

  1. Elements of which group form anions most readily_____.

A. Oxygen family                          B. Nitrogen group

C. Halogens                                   D. Alkali metals

 

  1. Atomic radii is expressed in _____.

A. Nm                 B. Cm                 C. Å                     D. m

 

  1. The atomic radii of the elements from left to right in the periodic table _____.

A. Decreases

B. Increases

C. Remain constant

D. First decreases and then increases

 

Answer Key:

  1. D

Explanation: All the elements belonging to the same group have the same number of electrons.

  1. A

Explanation: Ionic bond is formed when there is large difference of electro-negativities between the atoms.

  1. D

Explanation: Be : 1s2 2s2 Beryllium belongs to group 2. It will have 2 electrons in the valence shell.

  1. C

Explanation: Elements on the right side of the periodic table

are mostly non-metals.

  1. A

Explanation: Continuously decreases as the effective nuclear charge increases.

  1. A

Explanation: Size of atom increases down the group.

  1. C

Explanation: Be > C > F > Ne. Atomic size decreases across a period.

  1. C

Explanation: Halogens form anions most easily as they require only one electron to complete their octet.

  1. C

Explanation: Atomic radii are expressed in Å units.

  1. B