Advertisements
Advertisements
प्रश्न
Use the letters only written in the Periodic Table given below to answer the questions that Follow :
1) State the number of valence electrons in atom J.
2) Which element shown forms ions with a single negative charge?
3)Which metallic element is more reactive than R?
4) Which element has its electrons arranged in four shells?
उत्तर
1) 5
Atom J is a Group 5 element and a group is determined by the number of electrons present in the outermost shell.
2) Element M from Group 7 accepts one electron to form an ion with a single negative charge
3) T is more reactive than R.
The tendency of losing electrons increases down the group. Because chemical reactivity depends on the tendency to lose electrons, thus reactivity increases on going down the group.
4) Element T has its electrons arranged in four shells
Element T belongs to Period 4, and all elements of this period have four shells.
APPEARS IN
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.
State one reason for keeping fluorine and chlorine in the same of the periodic table.
Which of the following element would lose an electron easily?
(a) Mg
(b) Na
(c) K
(d) Ca
An element has 2 electrons in its N shell.
State the name assigned to this group.
An element X belong to 3rd periods and group II of the periodic table state:
name of the element,
On the basis of electronic configuration, how will you identify the first and the last element of a period?
What is meant by periodicity of elements?
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?
Arrange the following as per instruction given in the bracket.
K, Pb, Ca, Zn (increasing reactivity)
Arrange the following in order of increasing radii:
N, O, P
