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प्रश्न
Name an alkali metal in period 3 and halogen in period 2.
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उत्तर १
SOL: Na and F
उत्तर २
Period III alkali metal is sodium. Fluorine is a halogen found in period II.
संबंधित प्रश्न
Name two elements you would expect to show chemical reactions similar to magnesium. What is the basis for your choice?
What is the name of those elements which divide metals and non-metals in the periodic table?
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.
Which element has the electronic configuration 2, 8, 2?
What are the groups in a periodic table? Give two characteristics of each.
Name the type of elements which have two outermost shell incomplete.
Give the chemical formula of calcium phosphate
“Hydrogen occupies a unique position in Modern Periodic Table”. Justify the statement.
Choose an element from period 3 of modern periodic table that matches the description given below in instance. Give a reason for your choice.
It has same valency as Lithium.
An element has 2 electrons in its N shell.
Is it a metal or a non-metal?
