Question

B. Statements given below are incorrect. Write the correct statements.

1. Chadwick discovered the electron.

2. A proton is 1/1837 times heavier than an electron.

3. The electrons in the outermost orbit of an atom are called bound electrons.

4. The mass of neutron is equal to the hydrogen atom and it is positively charged.

5. The core of an atom is called its centre.​

Answer 1

Ans 1 - Joseph John Thomson discovered the electron

Ans 2 - The nucleus of a normal hydrogen atom is a proton. It is 1,837 times heavier than the electron.

Ans 3 - The electrons in the outermost orbit of an atom are called valence electrons.

Ans 4 - Protons and neutrons have approximately the same mass, about 1.67 × 10−24 grams, which scientists define as one atomic mass unit (amu) or one Dalton. Each electron has a negative charge (−1) equal to the positive charge of a proton (+1). Neutrons are uncharged particles found within the nucleus.

Ans 5 - The core of an atom is called its nucleus

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Answer 2

Answer:

1 J.J. Thomson discovered the electron

2 A proton is 1837 times heavier than an electron

3 The electron in the outermost orbit of an atom are called valence electrons

4 The mass of electron is equal to the mass of proton and it is positively charged

5The core of an atom is called it's nucleus

Explanation: