K-Chemistry com Chapter 7 Grade 10 SABIS Quiz 20

"What does the atomic number of an atom represent?"

• "The number of neutrons in the nucleus."
• "The number of protons in the nucleus."
• "The sum of protons and electrons."
• "The total number of electrons in the atom."

"The majority of an atom's mass comes from...?"

• "The electrons whizzing around."
• "The protons and neutrons in the nucleus."
• "The space between the nucleus and the electrons."
• "The empty void of the atom."

"What subatomic particles make up the nucleus of an atom?"

• "Protons and electrons."
• "Neutrons and electrons."
• "Protons and neutrons."
• "Only protons."

"How is a cation formed?"

• "By gaining an electron."
• "By losing an electron."
• "By gaining a proton."
• "By losing a neutron."

"In an atom, the electric charge is..."

• "Always positive."
• "Always negative."
• "Neutral, because the number of protons equals the number of electrons."
• "Neutral, because the number of protons equals the number of neutrons."

"What defines an isotope of an element?"

• "They have different atomic numbers."
• "They have different numbers of protons but the same number of neutrons."
• "They have the same number of protons but different numbers of neutrons."
• "They have the same number of protons and the same number of neutrons."

"Which is the smallest subatomic particle?"

• "Proton."
• "Neutron."
• "Electron."
• "All are the same size."

"The atomic mass number of an atom is the total number of..."

• "Protons in the nucleus."
• "Neutrons in the nucleus."
• "Electrons in the atom."
• "Protons and neutrons in the nucleus."

"An atom becomes an anion by..."

• "Losing an electron."
• "Gaining an electron."
• "Losing a proton."
• "Gaining a neutron."

"What is the typical size (diameter) of an atomic nucleus?"

• "10^-14 meters."
• "10^-10 meters."
• "10^14 meters."
• "10^10 meters."