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प्रश्न
Name the elements in Period 1.
उत्तर
Names of elements are (H) Hydrogen and Helium (He).
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संबंधित प्रश्न
Write the number of horizontal rows in the modern periodic table. What are these rows called?
The metal of Group 2 from top to bottom arc Be, Mg, Ca, Sr, and Ba.
1) Which one of these elements will form ions most readily and why?
2) State the common feature in the electronic configuration of all these elements.
Fill in the blank in the following statement:
The tendency to gain an electron ............... on moving down in a group of the periodic table.
The element which has the maximum number of valence electrons is:
(a) Na
(b) P
(c) Si
(d) A
The atomic numbers of three elements A, B and C are given below:
| Element | Atomic number |
| A | 5 |
| B | 7 |
| C | 10 |
(i) Which element belongs to group 18?
(ii) Which element belongs to group 15?
(iii) Which element belongs to group 13?
(iv) To which period/periods do these elements belong?
Explain
Size of atom changes when it loses or gain electron
Atomic number of an element is 16. State
- the period to which it belongs
- the number of valence electrons
- whether it is a metal or non-metal
Arrange the following in order of increasing radii:
Mg2+, Mg, Mg+
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 |
To which period do these elements belong?
An element A has 2 electrons in its fourth shell. State:
is it a metal or non-metal
