Explanation

• The identity of an element is determined by its number of protons (atomic number).
• Atoms of the same element can have different neutrons (isotopes).
• Therefore, only protons must remain identical.

Last verified on 25-05-2026

Explanation

• A proton (+ charge) is located inside the nucleus of the atom.
• An electron (– charge) moves outside the nucleus in energy levels.
• Proton is also much heavier than an electron.

Last verified on 25-05-2026

Explanation

• Natural gas contains about 80% to 95% methane.
• It is a hydrocarbon fuel.
• It is the chief (major) component of natural gas.
• It is also a greenhouse gas.
• Chemical formula: CH₄
• It is a clean-burning fuel used in daily life.

Last verified on 07-05-2026

Explanation

• Isotopes are atoms of the same element.
• They have the same number of protons but different neutrons.
• Due to different neutrons, their mass numbers differ.
• Example: Carbon-12, Carbon-13, Carbon-14.
• They show same chemical properties but different physical properties.

Last verified on 24-05-2026

Explanation

• Gamma rays have the highest penetrating power among these particles.
• Due to their lack of mass and charge.
• It allowing them to pass through most materials.

Additional information:

• Alpha radiation has the lowest penetrating power.

Last verified on 12-04-2026