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प्रश्न
The atomic numbers of three elements A, B and C are 12, 18 and 20 respectively. State, giving reason, which two elements will show similar properties.
उत्तर
The elements are,
A-(Atomic number 12) = Magnesium
B-(Atomic number 18) = Argon
C-(Atomic number 20) = Calcium
Element Calcium and magnesium will show similar properties as they belong to same group (Group II) of the periodic table. They have same number of valence electrons and they both are metals. While argon is a noble gas.
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संबंधित प्रश्न
An element 'X' has mass number 35 and number of neutrons 18. Write atomic number and electronic configuration of 'X'. Also write group number, period number and valency of 'X'.
What is its atomic number?
What is the common feature of the electronic configuration of the elements at the end of period 2, and period 3?
An element 'X' (Atomic number – 20) burns in the presence of oxygen to form a basic oxide.
(a) Identify the element and write its electronic configuration.
(b) State its group number and period number in the Modern Periodic Table.
(c) Write a balanced chemical equation for the reaction when this oxide is dissolved in water.
What is modern periodic law?
What is meant by a group in the periodic table?
Name and state the following with reference to the elements of the first three periods of the periodic table.
Valency of elements in Group 14 and 15.
Moving down in the second group, number of valence electrons ______.
Write the electronic configuration of two elements A and B whose atomic numbers are 20 and 17 respectively. Write the molecular formula of the compound formed when element A reacts with element B. State whether this compound is acidic, basic or neutral. Give a reason to justify your answer.
State the property trends in general of elements on moving down in a group of the periodic table.
