Advertisements
Advertisements
प्रश्न
Find the odd one out and give its explanation.
विकल्प
F
K
Cl
I
Advertisements
उत्तर
K
Explanation:
K is placed in group 1, while others are placed in group 17 of the modern periodic table.
APPEARS IN
संबंधित प्रश्न
In the Modern Periodic Table, calcium (atomic number 20) is surrounded by elements with atomic numbers 12, 19, 21, and 38. Which of these have physical and chemical properties resembling calcium?
Name the scientist who first of all showed that atomic number of an element is a more fundamental property than its atomic mass.
Fill in the following blank with suitable word:
Group 17 elements are known as ...............
How many periods and groups are there in the long form of periodic table?
What is the significance of atomic number in the modern classification of elements? Explain with the help of an example.
On which side of the periodic table will you find metals?
What is the name of those elements which divide metals and non-metals in the periodic table?
Would you place the two isotopes of chlorine, CI-35 and CI-37 in different slots because of their different atomic masses or in the same slot because their chemical properties are the same? Justify your answer.
The three elements having chemical symbols of Si, B and Ge are:
(a) all metals
(b) all non-metals
(c) all metalloids
(d) Si is metalloid, B is metal and Ge is non-metal
The atomic numbers of four elements P, Q, R and S are 6, 8, 14 and 16 respectively. Out of these, the element known as metalloid is:
(a) P
(b) Q
(c) R
(d) S
Consider the following elements:
Ca, Cl, Na, I, Li, Ba, Sr, K, Br
Separate these elements into three groups (families) of similar properties. State one property in each case on the basis of which you have made your choice.
How would the tendency to lose electrons change as we go from left to right across a period of the periodic table?
What is a period in a periodic table?
On the basis of electronic configuration, how will you identify chemically similar elements?
State the term
The tabular arrangement of elements in horizontal rows and vertical columns _________
What are horizontal rows and vertical columns in a periodic table known as?
Name two elements in Inert gas.
Name the type of elements which have one electron short of octet.
Arrange the elements of second and third periods in increasing order of their atomic size.
Third Period.
State the modern periodic law.
How does number of (i) valence electrons (ii) valency; vary on moving from left to right in the second period of a periodic table?
Give the symbol and valency of the following element and radical.
Sodium
Give the symbol and valency of the following element and radical.
Magnesium
Give the symbol and valency of the following element and radical.
Hydroxide
Give the symbol and valency of the following element and radical.
Carbonate
Give the chemical formula of sodium sulphite
Give the chemical formula of ammonium sulphate
Name the following:
The group of the Modern Periodic Table to which calcium [Ca2+] belongs.
State the number of elements in Period 1 of the Periodic Table.
State the number of elements in Period 2 of the Periodic Table.
What are the periods in a periodic table?
Distinguish between:
Group 17 - Group 18
Three elements A, B and C have 3, 4 and 2 electrons respectively in their outermost shell. Give the group number to which they belong in the Modern Periodic Table. Also, give their valencies.
A part of modern periodic table is given below. On its basis, answer the following questions:
| Group No. → | 1 | 2 | 13 | 14 | 15 | 16 | 17 | 18 |
| Period ↓ | ||||||||
| 2 | A | B | ||||||
| 3 | E | D | F | C |
Write the molecular formula of the compound formed by the combination:
A and F
An element ‘M' has 50% of the electrons filled in the 3rd shell as in the 2nd shell. The atomic number of ‘M’ is ______.
Give reason for the following:
Inert gases do not form ion.
