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प्रश्न
Element P has atomic number 19. To which group and period, does P belong? Is it a metal or a non-metal? Why?
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उत्तर
The atomic number of P = 19
Its electronic configuration = 2, 8, 8, 1
Group no. of the element = 1A
Period no. of the element = 4
P is a metal.
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संबंधित प्रश्न
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.
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?
State the trends in physical properties on moving down the group. Give an example to illustrate.
Name the element in period 3 which does not form oxide.
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?
An element belongs to the third period and Group IIIA (13) of the periodic table. State: the number of valence electrons,
An element belongs to the third period and Group IIIA (13) of the periodic table. State: if it is a metal or non-metal?
The electronic configuration of an element is 2, 8, 4. State it:
group and period in the Modern Periodic Table.
Write the electronic configuration of two elements A and B whose atomic numbers are 20 and 17 respectively. Write the molecular formula of the compound formed when element A reacts with element B. State whether this compound is acidic, basic or neutral. Give a reason to justify your answer.
