Question

which of the following atomic particles is electrically neutral? *
neutrons
protons
electrons
positrons
the discovery of the sixth quark was accomplished by *
using the hubble space telescope
bombarding gold foil with alpha particles
experimenting with cathode ray tube
studying proton collisions

Explanation:

1. Neutrons have no electric charge, making them electrically neutral. Protons have a positive charge, electrons have a negative charge, and positrons are the antiparticles of electrons and have a positive charge.
2. The discovery of the sixth - quark (top quark) was accomplished through studying proton - antiproton collisions in high - energy particle accelerators. The Hubble Space Telescope is used for astronomical observations, bombarding gold foil with alpha particles was Rutherford's experiment to discover the atomic nucleus, and cathode - ray tube experiments were related to the discovery of electrons.

Answer:

1. neutrons
2. studying proton collisions