An Element Belongs to the Third Period and Group Iiia (13) of the Periodic Table. State: If It is a Metal Or Non-metal? - Chemistry

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An element belongs to the third period and Group IIIA (13) of the periodic table. State: if it is a metal or non-metal?



It's a Metal.

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Chapter 5: The Periodic Table - Exercise 5 (C) [Page 94]


Selina Concise Science Chemistry 1 Class 9 ICSE
Chapter 5 The Periodic Table
Exercise 5 (C) | Q 2.3 | Page 94


Fill in the blank:

The formulae of chloride of metal M is MCl2. The metal M belongs to ……………. group.

Elements in the same group show the same valency. Give scientific reason.

Write the electronic configuration of K and Ne.

The atomic masses of three elements A, B and C having similar chemical properties are 7, 23 and 39, respectively.

  1. Calculate the average atomic mass of elements A and C.
  2. Compare the average atomic mass with atomic mass of B.
  3. What could the elements A, B and C be?

The electrons in the atoms of four elements A, B, C and D are distributed in three shells having 1, 3, 5 and 7 electrons in the outermost shell respectively. State the period in which these elements can be placed in  the modern periodic table. Write the electronic configuration of the atoms of A and D and the molecular formula of the compound formed when A and D combine.

What is meant by 'group' in the modern periodic table? How do the following change on moving from top to bottom in a group?

(i) Number of valence electrons

(ii) Number of occupied shells

(iii) Size of atoms

(iv) Metallic character of element

(v) Effective nuclear charge experienced by valence electrons

Write the number of vertical columns in the modern periodic table. What are these columns called?

Classify the following elements into metals, non-metals and metalliods

As, C, Hg, Mg, S, Si

Differentiate between Normal elements and Transition elements.

Name the element which is in seventeenth group and second period.

Arrange the following elements in the increasing order of their metallic character:
Mg, Ca, K, Ga

An element X belongs to group 2 and another element Y belongs to group 15 of the periodic table:

(a) What is the number of valence electron in X?
(b) What is the valency of X?
(c) What is the number of valence electrons in Y?
(d) What is the valency of Y?
Explain how you have arrived at your answers.

How does the electropositive character of elements change on going down in a group of the periodic table?

Why do elements in the same group show similar properties but the elements in different groups show different properties?

An element which is an essential constituent of all organic compounds belongs to following group of modern periodic table:

(a) group 4
(b) group 14
(c) group 15
(d) group 16

Which one of the following does not increase while moving down the group of the periodic table?

Name the type of elements .

two electrons in the outermost orbit - ……………

Complete the following sentences. 

The properties of the elements are a periodic function of their …………… (atomic number, mass number, reative atomic mass).


The noble gas with 3 shells.

An element 'M' has atomic number 12.

(a) Write its electronic configuration.

(b) State the group to which 'M' belongs.

(c) Is 'M' a metal or a non-metal.

(d) Write the formula of its chloride.

Atomic number of metal ‚A‛ is 11, while atomic number of metal ‚B‛ is 20. Which of them will be more reactive? Write the chemical reaction of dilute HCl  with metal ‚A‛.

Taking into consideration the period of the elements given below, answer the following questions: 

Elements Atomic Radius (pm)
O 66
B 88
C 77
N 74
Be 111
Li 152
  1. Arrange the above elements in decreasing order of their atomic radii.
  2. State the period to which the above elements belong.
  3. Why this arrangement of elements is similar to the above period of modern periodic table?
  4. Which of the above elements have the biggest and the smallest atom?
  5. What is the periodic trend observed in the variation of atomic radius while going from left to right within a period?

K, Pb, Ca, Zn (In the increasing order of the reactivity) 

Study the extract of the Periodic Table given below and answer the questions that follow. Give the alphabet corresponding to the element in question. DO NOT repeat an element. 

Which is an inert gas? 

Arrange the following in increasing order of property indicated
SiO2, P2O5, SO3, Cl2O7 (acidic nature)

Explain, the statement 'In each period, the atomic radii gradually decrease with increase in atomic number'. Give one example to justify your answer.

The metals of Group 2 from top to bottom are Be, Mg, Ca, Sr and Ba.State the common feature in the electronic configuration of all these elements

Arrange the following as per instruction given in the bracket. 

Li, K, Na, H ( decreasing order of their potential ionisation ) 

 The position of elements A, B, C, D and E in the periodic table are shown below:

Group 1

Group 2

Group 17

Group 18













Which is larger in size (i) D or E (ii) B or C

Element P has atomic number 19. To which group and period, does P belong? Is it a metal or a non-metal? Why?

An element belongs to the third period and Group IIIA (13) of the periodic table. State: the name of the element. 

State the nature of compounds formed when group 17 elements combine with (i) metals (ii) non-metals.

An element A has 2 electrons in its fourth shell. State:

is it an oxidising or reducing agent 

(a) Fill in the blanks and rewrite the completed statements: 

(i) ________ group in the periodic table contains elements that are all gases at room temperature. 

(ii) Very fine particles mainly scatter ______ light.

Fill in the blank and rewrite the completed statement:

________ group in the periodic table contains elements that are all gases at room temperature.

Give Scientific Reason:
Atomic size increase down the group.

Answer the following question:
State the four blocks of the modern periodic table based on the electronic configuration of elements.

What is the common feature of the electronic configuration of the elements at the end of Period 2 and Period 3?

Supply the missing word from those in bracket:

If an element has one electron in its outermost energy level [shell] then it is likely to be _______.

Name or state following with reference to the elements of the first three periods of the periodic table.

The number of electron shells in elements of period 1, period 2, and period 3.

Name or state following with reference to the element of the first three periods of the periodic table.

A non-metal in period 2 which is tetravalent.

State the following:

The group to which the element with an electronic configuration of 2, 8, 2 belongs.

Electron Affinity is maximum in ______.


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