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प्रश्न
Choose the correct option and rewrite the statement.
The number of electrons in the outermost shell of alkali metals is _______.
विकल्प
1
2
3
7
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उत्तर
The number of electrons in the outermost shell of alkali metals is 1.
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संबंधित प्रश्न
State whether the following statement is true of false:
The elements in a group have consecutive atomic numbers.
Rewrite the following statement after correction, if necessary:
Isotopes are the elements of the same group.
As element X has mass number 40 and contains 21 neutrons in its atom. To which group of the periodic table does it belong?
Write the names and symbols of two very reactive metals belonging to group 1 of the periodic table. Explain by drawing electronic structure, how either one of the two metals reacts with a halogen. With which name is the bond formed between these elements known and what is the class of the compound so formed known? State any four physical properties of such compounds.
An element X (atomic number 17) reacts with an element Y (atomic number 20) to form a compound.
(a) Write the position of these elements in the modern periodic table.
(b) Write the formula of the compound formed.
Justify your answer in each case.
What is the need for classification of elements?
What was the basis of the earliest attempts made for classification and grouping of elements?
State whether true or false. If false, correct the statement.
Metals can gain electrons.
Which of the following have inert gases 2 electrons in the outermost shell.
What property forms the basis of identification?
Which one of the following statements is not correct about the trends in the properties of the elements of a period on going from left to right?
The elements A, B, and C belong to groups 1, 14, and 17 respectively of the Periodic Table. Which two elements will form ionic compounds?
Which one of the following statements is not correct about the trends in the properties of the elements of a group on going down in a group?
In which group are inert elements placed?
An element with the atomic number 40 is placed in the period.
Which type of elements are poor conductors of heat and electricity?
How are elements grouped into various families in the periodic table?
