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प्रश्न
How do atomic structures (electron arrangements) change in a period with increase in atomic numbers from left to right?
उत्तर
As the atomic number increases from left to right in a periodic table, the size of the atom decreases.
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संबंधित प्रश्न
The atomic numbers of three elements A, B and C are 12, 18 and 20 respectively. State, giving reason, which two elements will show similar properties.
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 correct increasing order of the atomic radii of the elements oxygen, fluorine and nitrogen is:
(a) O, F, N
(b) N, F, O
(c) O, N, F
(d) F, O, N
Periodicity is observed due to the similar ______.
K, Pb, Ca, Zn (In the increasing order of the reactivity)
Choose the most appropriate answer from the following list of oxides which fit the description.
An amphoteric oxide.
Based on the group valency of element write the molecular formula of the following compound giving justification:
Oxide of first group elements.
The position of certain elements in the Modern Periodic Table is shown below:
Using the above table answer the following questions giving reasons in each case :
(i) Which element will form only covalent compounds?
(ii) Which element is a non-metal with valency 2?
(iii) Which element is a metal with valency 2?
(iv) Out of H, C, and F which has the largest atomic size?
(v) To which family does H, C, and F belong?
What is the common feature of the electronic configuration of the elements at the end of Period 2 and Period 3?
State the following:
The group which contains highly electropositive metals including sodium.
