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Question
Name the element which is in first group and third period.
Solution
Sodium (Na) is the element which is in the first group and the third period.
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RELATED QUESTIONS
The elements Be, Mg and Ca each having two electrons in their outermost shells are in periods 2, 3, and 4 respectively of the modern periodic table. Answer the following questions, giving justification in each case:-
(i) Write the group to which these elements belong.
(ii) Name the least reactive element.
(iii) Name the element having largest atomic radius.
The elements 4Be, 12Mg and 20Ca, each having two valence electrons in their valence shells, are in periods 2, 3 and 4 respectively of the modern periodic table. Answer the following questions associated with these elements, giving reason in each case:
(a) In which group should they be?
(b) Which one of them is least reactive?
(c) Which one of them has the largest atomic size?
Differentiate between Normal elements and Transition elements.
Rewrite the following statement after correction, if necessary:
The metallic character of elements in a period increases gradually on moving from left to right.
How does Nature of oxides of elements change on going from left to right in a period of the periodic table?
Give examples in support of your answer.
Five elements A, B, C, D and E have atomic numbers of 2, 3, 7, 10 and 18 respectively. The elements which belong to the same period of the periodic table are:
(a) A, B, C
(b) B, C, D
(c) A, D, E
(d) B, D, E
State whether the following statement is true or false
On moving horizontally across a period, number of valence electrons increases from one to eight.
'In a group, the atomic radii increase with increasing period number', explain this statement and justify it with reference to group 17.
Use the letters only written in the Periodic Table given below to answer the questions that follow:
(a) State the number of valence electrons in the atom J.(b) Which element shown forms ions with a single negative charge?
(c) Which Metallic element is more reactive than R?
(d) Which element has its electrons arranged in four shells?
An element A has 2 electrons in its fourth shell. State:
is it an oxidising or reducing agent
