The element with atomic number 12 is: MCQ with Answer and Explanation

Explanation:
Ernest Rutherford, along with his students Geiger and Marsden, conducted the famous gold foil experiment in 1911. By observing that a few alpha particles bounced back, he concluded that the atom has a small, dense, positively charged center called the nucleus.

Explanation:
Teflon (PTFE) has low friction and high heat stability, ideal for non-stick coatings. PVC for pipes; polystyrene for packaging; nylon for fibers.

Explanation:
Alpha particles, being heavy and doubly charged, cause intense ionization over a short distance. They are least penetrating. Gamma has low ionization but high penetration.