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प्रश्न
Name the metalloids in the first twenty elements.
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उत्तर
B (Boron), Si (Silicon).
संबंधित प्रश्न
Which of the following statement is correct in regard to the classification of elements?
(a) Elements in modern periodic table are arranged on the basis of increasing atomic masses.
(b) Elements in Mendeleev's periodic table are arranged on the basis of increasing atomic numbers.
(c) In modern periodic table, the element nickel of lower atomic mass is kept before the element cobalt of higher atomic mass.
(d) In modern periodic table, the isotopes of chlorine having different atomic masses are kept in the same group.
Helium and neon are unreactive gases. What, if anything, do their atoms have in common?
Name the scientist who stated the modern periodic law.
Give the chemical formula of magnesium nitrate
Give the chemical formula of calcium phosphate
Mendeleev's periodic table : atomic mass : : Modern periodic table : _______
What are groups and periods in the modern periodic table?
The arrangement of elements in the Modem Periodic Table is based on their ______
- Write the electronic configuration of element X, given by its symbol as under: \[\ce{^40_20 X}\]
- Determine its position in the modem periodic table.
- What is the nature of its oxide?
- Name one other element of its group.
Name the following metal:
A metal present in period 3, group 1 of the periodic table.
