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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
Write the electronic configuration of K and Ne.
From the following elements :
4Be; 9F; 19K; 20Ca
(i) Select the element having one electron is the outermost shell.
(ii) two elements of the same group.
Write the formula of and mention the nature of the compound formed by the union of 19K and element X(2, 8, 7).
Calculate the mass of Calcium that will contain the same number of the atom as are present in 3.2 gm of Sulphur.
[Atomic masses: S=32, Ca=40]
Fill in the blank in the following statement:
In going across a period (right to left) in periodic table, the atomic size of the atom ...............
An element X belong to 3rd periods and group II of the periodic table state:
the number of valence electrons,
Parts (i) to (v) refer to changes in the properties of elements on moving from left to right across a period of the periodic table. For each property, choose the letter corresponding to the correct answer from the choices (a), (b), (c) and (d).
(i) The non metallic character of the elements:
(a) Decreases
(b) Increases
(c) Remains the same
(d) Depends on the period
(ii) The electro negativity
(a) Depends on the number of valence electrons
(b) Remains the same
(c) Decreases
(d) Increases
(iii) The ionization potential
(a) Goes up and down
(b) Decreases
(c) Increases
(d) Remains the same
(iv) The atomic size
(a) Decreases
(b) Increases
(c) Remains the same
(d) Sometimes increases and sometimes decreases
(v) The electron affinity of the elements in groups 1 to 7:
(a) Goes up and down
(b) Decreases and then increases
(c) Increases
(d) decreases
The following questions refer to the Periodic Table.
What is the common feature of the electronic configurations of the elements in group 7?
Choose the most appropriate answer from the following list of oxides which fit the description.
An oxide which dissolves in water forming an acid.
Formula of ion of A is A2+. Element A probably belongs to ______ group.
Name and state the following with reference to the elements of the first three periods of the periodic table.
Alkaline earth metal in period 3.
