Advertisements
Advertisements
प्रश्न
Fill in the blank:
The modern periodic table consists of ……………. periods.
Advertisements
उत्तर
The modern periodic table consists of 7 periods.
APPEARS IN
संबंधित प्रश्न
Name two elements you would expect to show chemical reactions similar to magnesium. What is the basis for your choice?
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 18 elements are called ...............
Give two example of group 1 elements.
Give two example of group 17 elements.
Give two example of group 18 elements.
How were the positions of cobalt and nickel resolved in the modern periodic table?
On which side of the periodic table will you find non-metals?
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.
Name the scientist who prepared modern periodic table.
Which element has two shells, both of which are completely filled with electrons?
Explain why All the elements of a period have different chemical properties.
On the basis of electronic configuration, how will you identify chemically similar elements?
Explain why, the first period of the periodic table has only two elements whereas second period has eight elements
In the modern Periodic Table, why does cobalt with higher atomic mass of 58.93 appear before nickel having lower atomic mass of 58.71?
Name two elements in Alkali metals.
What do you understand by typical elements?
Write the number of protons, neutrons and electronic configuration of \[\ce{_19^39K, _15^31P}\]. Also state their position in periodic table.
An element E has following electronic configuration:
|
K |
L |
M |
|
2 |
8 |
6 |
(a) To which group of the periodic table does element E belong?
(b) To which period of the periodic table does element E belong?
(c) State the number of valence electrons present in element E.
(d) State the valency of the element E.
Write a short note.
Structure of the modern periodic table.
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.
Hydrogen
Give the symbol and valency of the following element and radical.
Carbonate
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.
Answer the following question in one sentence.
The modern periodic table is divided into which blocks?
Distinguish between:
s-block - p-block
Explain structure of modern periodic table in short.
Noble gases belong to______ group of the periodic table.
The arrangement of elements in the Modem Periodic Table is based on their ______
On moving from left to right in a period in the periodic table, the size of the atom ______
An element which is an essential constituent of all organic compounds belongs to
Compare the radii of two species X and Y. Give reasons for your answer.
- X has 12 protons and 12 electrons
- Y has 12 protons and 10 electrons
______ group elements are called alkaline earth metals.
Define groups of modern periodic table.
Name the following metal:
A metal present in period 3, group 1 of the periodic table.
An element has 2 electrons in its N shell.
State its position in periodic table.
Answer the following in respect of element \[\ce{_16^32S}\].
To which group and period does it belong?
