Ab Padhai karo bina ads ke

Khareedo DN Pro and dekho sari videos bina kisi ad ki rukaavat ke!

PERIODIC CLASSIFICATION OF ELEMENTS

PERIODIC CLASSIFICATION OF ELEMENTS

METALS AND NON-METALS

TEST PAPER 1

(a) On what basis did Mendeleev arrange the elements in his periodic table?
(b) On what basis are they arranged now?

(a) In the modern periodic table, which are the metals among the first ten element?
(b) What is the significance of atomic number in the modern classification of elements? Explain with the help of an example.

How are the less reactive metals (which are quite low in the reactivity series) extracted? Explain with the help of an example.

(a) A student dropped a few pieces of marble in dilute hydrochloric acid contained in
a test tube. The evolved gas was passed through lime water. What change would
be observed in lime water ? Write balanced chemical equations for both the
changes observed.
(b) State the chemical property in each case on which the following uses of baking
soda are based:
(i) as an antacid (ii) as a constituent of baking powder.

The atomic radii of the elements of second period are given below:
(a) Arrange these elements in the decreasing order of their atomic radii (Keeping the element with the largest atomic radius first).
(b) Are the elements now arranged in the pattern of a period in the periodic table?
(c) Which elements have the largest and the smallest atoms?
(d) From this data, infer how the atomic size (or atomic radius) of the elements changes as you go from left to right in a period?

(a) Explain why:
(i) All the elements of a group have similar chemical properties.
(ii) All the elements of a period have different chemical properties.
(b) The atomic radii of three elements X,Y and Z of a period of the periodic table are 186 pm, 104 pm and 143 pm respectively. Giving reason arrange these elements in the increasing order of atomic numbers in the period.

The atomic radii of the elements of second period are given below:
(a) Arrange these elements in the decreasing order of their atomic radii (Keeping the element with the largest atomic radius first).
(b) Are the elements now arranged in the pattern of a period in the periodic table?
(c) Which elements have the largest and the smallest atoms?
(d) From this data, infer how the atomic size (or atomic radius) of the elements changes as you go from left to right in a period?

Given below are the atomic radii of some elements of second period.
ElementBONCAtomic Radius in pm88667477
Arrange these elements in the increasing order of their atomic number. Give reason for your answer.

आवर्त सारणी के वर्ग 1 के तीन तत्त्वों A , B और C की परमाणु त्रिज्याएँ क्रमश: 155 pm , 190 pm और 235 pm है । कारण देकर इन तत्त्वों को वर्ग में बढ़ती हुई परमाणु संख्याओं के क्रम में सजाएँ ।

Atomic radii of some elements in the periodic table are as given below . 152 pm , 186 pm , 231 pm , 244 pm , Do these elements belong to group or period ?

If the ionic radii of the three elements X, Y and Z of a group in a periodic table are 135 pm, 95 pm and 60 pm, respectively, arrange them in ascending order of atomic number from the element.

The atomic radii of first group elements of the Periodic Table are as follows:
(i) Arrange these elements in the increasing order of their atomic radii. (ii) Name the elements which have the smallest and the largest atoms. (iii) How does the atomic size vary as you go down a group?

The atomic radii of three elements A, B and C of a periodic table are 186 pm, 104 pm and 143 pm respectively. Giving a reason, arrange these elements in the increasing order of atomic numbers in the period.

Atomic radii of the elements of the second period are given below: Period II elements: B Be O N Li C Atomic radius (pm): 88 111 66 74 152 77 Arrange them in decreasing order of their atomic radii.

Study the variation in the atomic radii of first group elements given below and arrange them in an increasing order.
Group I elements : Na Li Rb Cs K Atomic radius (pm): 186 152 244 262 231

You are watching: The atomic radii of group 1 elemetns of the periodic table are as foll. Info created by GBee English Center selection and synthesis along with other related topics.