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प्रश्न
Name the metalloids in the first twenty elements.
उत्तर
B (Boron), Si (Silicon).
संबंधित प्रश्न
What is the usual number of valence electrons and valency of group 18 elements of the periodic table?
Write the number of protons, neutrons and electronic configuration of \[\ce{_19^39K, _15^31P}\]. Also state their position in 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.
Hydroxide
Give the chemical formula of sodium nitrate
Fill in the blank:
The element lithium in the Modern Periodic Table with valency 1+ belongs to the group ______.
In the modern periodic table, the positions of 1 to 20 elements are shown here. Identify the elements A and B. Write their atomic number.
Noble gases belong to______ group of the periodic table.
______ and ______ are called inner transition elements.
An element ‘M' has 50% of the electrons filled in the 3rd shell as in the 2nd shell. The atomic number of ‘M’ is ______.
