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प्रश्न
Position of A, B and C three elements is given in the table from the modern periodic table. Answer the following questions.
| Periods | Group 2 | Group 17 |
| 2 | ----- | A |
| 3 | B | ----- |
| 4 | ----- | C |
- What is an element metal or nonmetal?
- Which is the outermost orbit of element B?
- Identify C element and it's physical state.
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उत्तर
- Element A is a non-metal.
- Outermost shell of element B is M.
- Element C is bromine (Br), and it exists in a liquid state.
संबंधित प्रश्न
Name two elements you would expect to show chemical reactions similar to magnesium. What is the basis for your choice?
Compare and contrast the arrangement of elements in Mendeleev’s periodic Table and the Modern Periodic Table.
What is periodicity in properties of elements with reference to the Modern Periodic Table?
Why do all the elements of the same group have similar properties?
where should hydrogen be placed in the modern periodic table? Give reason for 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 number of valence electrons in the atoms of first elements in a period?
What is the major characteristic of the first elements in the periods of the periodic table? What is the general name of such elements?
What is the fundamental difference in the electron configurations between the group 1 and group 2 elements?
From the standpoint of atomic structure, what determines which element will be the first and which the last in a period the periodic table?
Which of the following are the correct characteristics of isotopes of an element?
(i) same atomic mass
(ii) same atomic number
(iii) same physical properties
(iv) same chemical properties
(a) (i), (ii) and (iv)
(b) (ii), (iii) and (iv)
(c) (ii) and (iii)
(d) (ii) and (iv)
Give the group number of following elements present in periodic table
What are horizontal rows and vertical columns in a periodic table known as?
Name two elements in each case:
Transition element
Name the metals in the first twenty elements.
Name the type of elements which have two electrons in the outermost orbit.
State its position in the periodic table?
Fill in the blank:
The horizontal rows in the periodic table are called _____________.
What is the number of elements in the 3rd period, of the modern periodic table?
Give the symbol and valency of the following element and radical.
Potassium
Give the symbol and valency of the following element and radical.
Sulphate
Give the chemical formula of calcium phosphate
How were elements arranged in the long form of the periodic table or the Modern Periodic Table?
Right or wrong sentence.
The modern periodic table has 1 to 7 periods.
Distinguish between:
s-block - p-block
An X element with atomic number 11 and Y element with atomic number 13 belongs to the third period in the modern periodic table. With this information, give the answers of the below questions.
- Which element has more metallic character from these two elements?
- What is the valency of each X and Y elements?
- Atom size of Y element is smaller than atom size of X element? Explain?
What are groups and periods in the modern periodic table?
On moving from left to right in a period in the periodic table, the size of the atom ______
Which of the given elements A, B, C, D and E with atomic number 2, 3, 7, 10 and 30 respectively belong to the same period?
Which of the following elements would lose an electron easily?
The three elements A, B and C with similar properties have atomic masses X, Y and Z respectively. The mass of Y is approximately equal to the average mass of X and Z. What is such an arrangement of elements called as? Give one example of such a set of elements.
Arrange the following elements in the increasing order of their metallic character
| Mg, | Ca, | K, | Ge, | Ga |
An element has the atomic number 12.
- Write the electric configuration.
- To which group and period does it belong.
Explain the position of hydrogen in the periodic table.
Define periods of modern periodic table.
An element with atomic number ______ will form a basic oxide.
An element has 2 electrons in its N shell.
Is it a metal or a non-metal?
A group of elements in the periodic table is given below (Boron is the first member of the group and Thallium is the last).
Boron, Aluminium, Gallium, Indium, Thallium
Answer the following question in relation to the above group of elements:
If the electronic configuration of aluminium is 2, 8, 3, how many electrons are there in the outer shell of thallium?
