Chemistry
Assertion (A): When an atom gains one or more electrons, it becomes negatively charged.
Reason (R): The number of electrons in an atom exceeds the number of protons upon gaining electrons.
- Both A and R are true and R is the correct explanation of A.
- Both A and R are true but R is not the correct explanation of A.
- A is true but R is false.
- A is false but R is true.
Answer
Both A and R are true and R is the correct explanation of A.
Explanation — In a neutral atom, the number of electrons and protons are equal, so they are electrically neutral. However, when an atom gains one or more electrons, the number of electrons in an atom exceeds the number of protons, and the atom becomes negatively charged.
Related Questions
The valencies shown by copper is:
- 1 and 2
- 2 and 3
- 2 and 4
- 1 and 3
Which of the following represents the correct symbol of potassium ion ?
- K
- K+
- K2+
- K3+
Assertion (A): Each element has its own unique symbol, which is a short hand representation of its atom.
Reason (R): The symbol of some elements is the same as the first letter of their names.
- Both A and R are true and R is the correct explanation of A.
- Both A and R are true but R is not the correct explanation of A.
- A is true but R is false.
- A is false but R is true.
Assertion (A): Magnesium burns in oxygen to produce a compound magnesium oxide with the molecular formula MgO.
Reason (R): Magnesium oxide is a white amorphous solid.
- Both A and R are true and R is the correct explanation of A.
- Both A and R are true but R is not the correct explanation of A.
- A is true but R is false.
- A is false but R is true.