Advertisements
Advertisements
Question
Right or wrong sentence.
The K and L shells of the elements Na and Mg contain electrons.
Options
Right
Wrong
Advertisements
Solution
The given sentence is right.
Explanation:
- Both sodium (Na) and magnesium (Mg) have electrons in their K and L shells; specifically, their K shells are filled with 2 electrons and their L shells are filled with 8 electrons.
- While they also have electrons in their M shells (1 and 2, respectively), it is factually accurate to state that the K and L shells contain electrons.
APPEARS IN
RELATED QUESTIONS
How does the electronic configuration of an atom relate to its position in 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?
What is the significance of atomic number in the modern classification of elements? Explain with the help of an example.
Name the scientist who prepared modern 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.
The modern periodic table was prepared by ______.
(b) What is the number of elements is 3rd period, the modern periodic table?
In the modern Periodic Table, why does cobalt with higher atomic mass of 58.93 appear before nickel having lower atomic mass of 58.71?
Define:
Periodic table
Correct the statement.
Copper and zinc are representative elements.
Name two elements in Alkali metals.
Name the type of elements which have outermost shell complete.
Name the type of elements which have two electrons in the outermost orbit.
State its position in the periodic table?
The electronic configuration of an element T is 2, 8, 8, 1.
What is the group number of T?
Name the noble gas with 3 shells.
Write a short note.
Position of isotopes in the Mendeleev’s and the modern periodic table.
Define the atomic size.
Name the cation and the anion in the salt – calcium sulphate
Give the symbol and valency of the following element and radical.
Calcium
Give the symbol and valency of the following element and radical.
Aluminium
Give the symbol and valency of the following element and radical.
Zinc
Give the symbol and valency of the following element and radical.
Hydroxide
Give the symbol and valency of the following element and radical.
Sulphate
State what the group number in the Modern Periodic Table signifies. Give a reason why elements in the same group, have similar valency and similar chemical properties.
Right or wrong sentence.
To the left of the zig-zag line in the periodic table are the metal elements.
Write a scientific reason.
There was ambiguity about the correct position of hydrogen in Mendeleev’s periodic table.
What are groups and periods in the modern periodic table?
______ forms the basis of the modern periodic table.
______ and ______ are called inner transition elements.
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 |
A part of modern periodic table is given below. On its basis, answer the following questions:
| Group No. → | 1 | 2 | 13 | 14 | 15 | 16 | 17 | 18 |
| Period ↓ | ||||||||
| 2 | A | B | ||||||
| 3 | E | D | F | C |
Which of the element is a Metalloid?
An element belonging to 3d series of modern periodic table has spin magnetic moment = 5.92 B.M. in +3 oxidation state. The atomic number of elements are ______.
1H2 is an isotope of hydrogen. In the modern Periodic Table it will ______.
Match the atomic number with the following:
A rare gas.
