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प्रश्न
Give the chemical formula of sodium hydroxide
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उत्तर
It denotes in a compound, the number of atoms of element present.
∴ Formula = \[\ce{NaOH}\]
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संबंधित प्रश्न
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
What is the usual number of valence electrons in the atoms of the last element in a period?
What are the periods in a periodic table?
Mendeleev's periodic table : atomic mass : : Modern periodic table : _______
Write an Explanation.
Period
Complete the following flow chart.
______ is the longest period in the periodical table.
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 |
Which of the element is a Metalloid?
Give reason for the following:
Inert gases do not form ion.
