Advertisements
Advertisements
प्रश्न
Elements X, Y and Z have atomic numbers 6, 9 and 12 respectively. Which one:
- Forms an anion
- Forms a cation
- Has four electrons in its valence shell?
Advertisements
उत्तर
The electronic configuration of:
X (6) = 2, 4
Y (9) = 2, 7
Z (12) = 2, 8, 2
- Y forms an anion as it needs just one more electron to complete its octet.
- Z forms a cation. It will lose its 2 electrons to achieve a stable electronic configuration, thus forming a cation.
- An ionic bond is formed between Y and Z and its molecular formula is ZY2.
APPEARS IN
संबंधित प्रश्न
What are the two main features of Rutherford’s atomic model?
Fill in the following blanks :
| Atomic Number | Mass Number | Protons | Neutrons | Electrons | Symbol |
| 10 | 22 | _________ | _________ | _________ | _________ |
The mass number of an element is 23 and it contains 11 electrons. What is the number of protons and neutrons in it? What is the atomic number of the element?
(a) What is meant by (i) atomic number, and (ii) mass number, of an element? Explain with the help of an example.
(b) What is the relation between the atomic number and mass number of an element?
(c) If an element M has mass number 24 and atomic number 12, how many neutrons does its atom contain?
The properties of the elements are a periodic function of their __________.
An atom of an element has two electrons in the M shell.
What is the (a) atomic number (b) number of protons in this element?
If an atom ‘A’ has mass number 35 and atomic number 17, state the number of protons, electrons and neutrons it contains.
The diagram represents an isotope of hydrogen [H]. Answer the following:
Atomic no. = 1
Mass no. = 1
If an isotope of ‘H’ has mass no. = 2, how many electrons does it have.
Draw the structure of the following atoms showing the nucleus containing – protons, neutrons and the orbits with the respective electron:
Isotopes of hydrogen [11H, 21H, 31H]
Ca2+ has completely filled outer shell. Justify your answer.
