Advertisements
Advertisements
प्रश्न
Write the name and symbol of the element from the description.
The noble gas with the smallest atomic radius.
Advertisements
उत्तर
Name: Helium
Symbol: He
संबंधित प्रश्न
What do you understand by atomic size? State its unit?
Why is the size of neon greater than fluorine?
Why is the size of sodium is greater than magnesium?
Fill in the blank:
On moving across a period from right to left in the periodic table, the atomic size of the atom ___________.
Give reason for the following:
Argon atom is bigger than chlorine atom.
Give scientific reasons for the following:
Atomic radius goes on decreasing while going from left to right in a period.
Fill in the blanks.
Size of the atoms ______ from left to right across a period and ______ on descending in a group of normal elements.
Arrange the following as per the instruction given in the bracket
Na, K, Li (Increasing atomic size)
The size of an atom is indicated by its _______.
Write an Explanation.
Atomic radius
Write scientific reason.
In same period, boron and oxygen elements have different atomic size.
Some elements and their atomic radii are given here. Arrange them in decreasing order of their atomic radii. Identify which of the above elements is the biggest atom and which is smallest?
| Element | K | Na | Rb | Cs | Li |
| Atomic radius (pm) | 231 | 186 | 244 | 262 | 151 |
Which of the following gives the correct increasing order of the atomic radii of O, F and N?
Which of the following are the characteristics of isotopes of an element?
- Isotopes of an element have same atomic masses
- Isotopes of an element have same atomic number
- Isotopes of an element show same physical properties
- Isotopes of an element show same chemical properties
Elements have been arranged in the following sequence on the basis of their increasing atomic masses.
| F, | Na, | Mg, | Al, | Si, | P, | S, | Cl, | Ar, | K |
- Pick two sets of elements which have similar properties.
- The given sequence represents which law of classification of elements?
An element X (atomic number 17) reacts with an element Y (atomic number 20) to form a divalent halide.
- Where in the periodic table are elements X and Y placed?
- Classify X and Y as metal (s), non-metal (s) or metalloid (s)
- What will be the nature of oxide of element Y? Identify the nature of bonding in the compound formed
- Draw the electron dot structure of the divalent halide
Atomic number of a few elements are given below
10, 20, 7, 14
- Identify the elements
- Identify the Group number of these elements in the Periodic Table
- Identify the Periods of these elements in the Periodic Table
- What would be the electronic configuration for each of these elements?
- Determine the valency of these elements
An element with the largest atomic radius among the following is ______.
Give reason for the following:
The size of a Cl− ion is greater than the size of a Cl atom.
