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Question
Fill in the blank and rewrite the completed statement:
________ group in the periodic table contains elements that are all gases at room temperature.
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Solution
The 18th group in the periodic table contains elements that are all gases at room temperature.
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RELATED QUESTIONS
Given below are some elements of the modern periodic table. Atomic number of the element is given in parentheses.
A(4), B(9), C(14), D(19), E(20)
(a) Select the element that has one electron in the outermost shell. Also, write the electronic configuration of this element.
(b) Which two elements amongst these belong to the same group? Give reasons for your answer.
(c) Which two elements amongst these belong to the same period? Which one of the two has bigger atomic radius?
The position of eight elements in the Modern Periodic Table is given below where atomic numbers of elements are given in the parenthesis.
| Period No. | ||
| 2 | Li(3) | Be(4) |
| 3 | Na(11) | Mg(12) |
| 4 | K(19) | Ca(20) |
| 5 | Rb(37) | Sr(38) |
(i) Write the electronic configuration of Ca.
(ii) Predict the number of valence electrons in Rb.
(iii) What is the number of shells in Sr?
(iv) Predict whether K is a metal or a non – metal.
(v) Which one of these elements has the largest atom in size?
(vi) Arrange Be, Ca, Mg and Rb in the increasing order of the size of their respective atoms.
How many groups and periods are there in the modern periodic table?
List any two properties of the elements belonging to the first group of the modern periodic table.
Define the term : Atomic size
Consider two elements 'X' (Atomic number 17) and 'Y' (Atomic number 20)
(i) Write the positions of these elements in the modern periodic table giving justification.
(ii) Write the formula of the compound formed by the combination of 'X' and 'Y'.
(iii) Draw the electron-dot structure of the compound formed and state the nature of the bond formed between the two elements ?
Which element has twice as many electrons in its second shell as in its first shell?
Use the letters only written in the Periodic Table given below to answer the questions that Follow:
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| Element | w | x | y | z |
| Electronic configurations |
2, 8, 1 | 2, 8, 7 | 2, 5 | 1 |
Answer the following questions based on the table above:
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a) W and X
b) Y and Z
2) What is the formula of the compound formed between :
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2) State the common feature in the electronic configuration of all these elements.
How does the valency of elements change of moving from left to right in the third period of the periodic table?
Nitrogen (atomic number 7) and phosphorus (atomic number 15) belong to group 15 of the periodic table. Write the electronic configuration of these two elements. Which of these will be more electronegative? Why?
In which part of a group would you separately expect the elements to have the largest atomic size?
Why does the size of the atoms progressively become smaller when we move from sodium (Na) to chlorine (Cl) in the third period of the periodic table?
The atomic numbers of the elements Na, Mg, K and Ca are 11, 12, 19 and 20 respectively. The element having the largest atomic radius is:
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(c) K
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(a) increases
(b) decreases
(c) remain the same
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An element X belong to 4th period and 17th group, state.
name the family to which it belong.
How does the number of:
valency vary on moving from left to right in the second period of the periodic table?
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The similarities in the properties of a group of elements are because they have the same …………………
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Which is more electronegative than chlorine?
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‛.
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. 
The ion of which element will migrate towards the cathode during electrolysis?
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Select the correct answer
Number of shells in potassium are
What is the common feature of electronic configurations of the elements at the end of period 2 and period 3?
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Name the first and last element in period 2.
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An oxide which dissolves in water forming an acid.
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Arrange the following in order of increasing radii:
N, O, P
The elements of one short period of the periodic table are given below in order from left to right:
| Li | Be | B | C | O | F | Ne |
One element of this period is missing. Which is the missing element and where should it be placed?
Formula of ion of A is A2+. Element A probably belongs to ______ group.
(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.
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Name or state following with reference to the elements of the first three periods of the periodic table.
A metalloid in period 2 and in period 3.
State the following:
The group to which the element with an electronic configuration of 2, 8, 2 belongs.
Electron Affinity is maximum in ______.
