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प्रश्न
Name the metals in the first twenty elements.
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उत्तर
Li, Be, Na, Mg, Al, K and Ca.
संबंधित प्रश्न
What is the significance of atomic number in the modern classification of elements? Explain with the help of an example.
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.
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 major characteristic of the first elements in the periods of the periodic table? What is the general name of such elements?
Explain why All the elements of a group have similar chemical properties.
What is the usual number of valence electrons and valency of group 18 elements of the periodic table?
Define the atomic size.
Give the symbol and valency of the following element and radical.
Chlorine [Chloride]
An element with atomic number ______ will form a basic oxide.
