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प्रश्न
The similarities in the properties of a group of elements are because they have the same ______.
विकल्प
electronic configuration
number of outer electrons
atomic numbers
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उत्तर
The similarities in the properties of a group of elements are because they have the same number of outer electrons.
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संबंधित प्रश्न
Study the following table in which positions of six elements A, B, C, D, E and F are shown as they are in the modern periodic table:
|
Group→
Period↓ |
1
|
2
|
3-12
|
13
|
14
|
15
|
16
|
17
|
18
|
| 2 | A | B | C | ||||||
| 3 | D | E | F |
On the basis of the above table, answer the following questions:-
(i) Name the element which forms only covalent compounds.
(ii) Name the element which is a metal with valency three.
(iii) Name the element which is a non-metal with valency three.
(iv) Out of D and E, which is bigger in size and why?
(v) Write the common name for the family to which the elements C and F belong.
Differentiate between Normal elements and Transition elements.
Arrange the following elements in the increasing order of their metallic character:
Mg, Ca, K, Ga
In terms of electronic configurations, explain the variation in the size of the atoms of the elements belonging to the same period and same group ?
In each of the following pair, choose the atom having the bigger size:
Na (At. No. 11) or K (At. No. 19)
Four elements P, Q, R and S belong to the third period of the Modern Periodic Table and have respectively 1, 3, 5 and 7 electrons in their outermost shells. Write the electronic configurations of Q and R and determine their valences. Write the molecular formula of the compound formed when P and S combine.
On the basis of electronic configuration, how will you identify the first and the last element of a period?
An element Z has atomic number 16. Answer the following
(a) State the period and group to which Z belongs
(b) Is Z a metal or a non-metal?
(c) State the formula between Z and hydrogen.
(d) what kind of a compund is this?
Choose the most appropriate answer from the following list of oxides which fit the description.
An amphoteric oxide: Al2O3 (shows both acidic and basic properties)
Going across a period left to right, atomic size _____.
