Advertisements
Advertisements
Question
What are the elements.
Advertisements
Solution
“Elements are pure substances made up of one kind of atoms and cannot be broken down into simpler substances.” 118 elements are there.
APPEARS IN
RELATED QUESTIONS
Compare and contrast the arrangement of elements in Mendeleev’s periodic Table and the Modern Periodic Table.
Fill in the following blank with suitable word:
The basis for modern periodic table is ...............
Fill in the following blank with suitable word:
Group 17 elements are known as ...............
Give alongside is a part of the periodic table :
As we move horizontally from left to right:
| Li | Be | B | C | N | O | F | |
| Na | Mg | Al | Si | P | S | Cl |
(i) What happens to the metallic character of the elements?
(ii) What happens to the atomic size?
From the standpoint of atomic structure, what determines which element will be the first and which the last in a period the periodic table?
Name an alkali metal in period 3 and halogen in period 2.
Give the symbol and valency of the following element and radical.
Oxygen [Oxide]
Give the symbol and valency of the following element and radical.
Nitrate
Give the symbol and valency of the following element and radical.
Bisulphate
Identify gas A in the following experiment.
