Understanding Isotopes and Nuclear Reactions

What particles make up the nucleus of an atom?

• Electrons only

• Neutrons and electrons

• Protons and neutrons

• Protons and electrons

What defines isotopes of the same element?

• Same mass

• Same number of electrons only

• Same number of neutrons

• Same number of protons and electrons

Who discovered the electron and identified different types of neon atoms?

• Niels Bohr

• J.J. Thomson

• Ernest Rutherford

• Albert Einstein

What machine did Francis W. Aston invent?

• Mass spectrograph

• Electron microscope

• X-ray machine

• Particle accelerator

What do the numbers in isotopes of neon represent?

• Total number of electrons

• Total number of protons

• Total number of protons plus neutrons

• Total number of neutrons

Why can the mass of electrons be ignored when calculating the mass of an atom?

• They are not part of the atom

• They have no mass

• They have the same mass as neutrons

• Their mass is negligible compared to protons and neutrons

What defines chemical reactivity in atoms?

• Electrons

• Neutrons

• Nucleus

• Protons

What determines the type and intensity of a chemical reaction?

• Outer electrons

• Neutrons

• Protons

• Nucleus

What force holds the nucleus together?

• Weak Nuclear Force

• Gravitational Force

• Strong Nuclear Force

• Electromagnetic Force

What happens during Alpha Decay?

• Protons and neutrons rearrange

• An electron is ejected

• Two neutrons and two protons are ejected

• A neutron splits into a proton and an electron