1 Why noble gases are chemically inert? A High atomic mass B Incomplete valence shell C Complete valence shell D Low electronegativity
2 Khalid is learning about sub-shells. He knows that the s sub-shell can hold a maximum of 2 electrons. How many electrons can the d sub-shell hold? A 2 B 6 C 10 D 14
4 Yusuf is studying the periodic table and learns that elements in Group 17 are called halogens. He knows that fluorine is the most electronegative element. Which halogen is the least electronegative? A Fluorine B Chlorine C Bromine D Iodine
5 Emma is studying the group number and charge on ions. She knows that elements in Group 2 lose two electrons to form +2 ions. Which element is likely to form a +2 ion? A Sodium B Magnesium C Chlorine D Fluorine
6 Omar is studying isotopes of hydrogen. He learns that hydrogen has three isotopes: protium, deuterium, and tritium. How do these isotopes differ? A They have different numbers of protons B They have different numbers of neutrons C They have different numbers of electrons D They have different numbers of nuclei
7 Tina is studying noble gases. She knows that they are generally unreactive because they have a full valence shell. Which of the following is a noble gas? A Helium B Sodium C Chlorine D Iron
8 Rania is studying carbon dating. She learns that carbon-14 has a half-life of about 5730 years. What does half-life mean? A The time it takes for half of the atoms in a sample to decay B The time it takes for all atoms to decay C The time it takes for half of the atoms to become stable D The time it takes for the isotope to be completely used up
9 Ivan is learning about ions. He knows that atoms can gain or lose electrons to become ions. What is an anion? A A positively charged ion B A negatively charged ion C A neutral atom D An atom with no electrons
10 Mohamed is learning about the nucleus. He understands that the nuclear force holds the nucleus together. Why is the nuclear force necessary? A To overcome the attractive force between protons and electrons B To overcome the repulsive electrostatic force between protons C To keep electrons in orbit D To separate neutrons from protons
11 Ibrahim is learning about electron affinity. He knows that electron affinity is the energy change when an electron is added to a gaseous atom. Which group has the most negative electron affinities (most favorable)? A Alkali metals B Halogens C Noble gases D Alkaline earth metals
12 Julia is learning about charge neutrality in atoms. She knows that atoms are electrically neutral. What does this mean? A The number of protons equals the number of neutrons B The number of protons equals the number of electrons C The number of electrons equals the number of neutrons D There are no charged particles in the atom
13 Ming is studying transition elements and their compounds. He notes that transition metal compounds are often colored. Why are transition metal compounds colored? A Because they absorb light due to electron transitions in d-orbitals B Because they are always solid C Because they react with acids D Because they have variable oxidation states
15 Atomic number is equal to the number of: A Neutrons B Protons C Electrons and neutrons D Protons and neutrons
17 Patricia is studying the lanthanides and actinides. She knows these are inner transition elements. Where are they placed in the periodic table? A In the main body of the periodic table B At the top of the periodic table C Separately below the main periodic table D They are not in the periodic table
18 According to particle theory, matter is made up of: A Energy B Large blocks C Tiny particles D Cells
19 Emma is studying the periodic table and notices that Group 2 elements have 2 valence electrons. She predicts that they will form ions with a +2 charge. What is the name of Group 2? A Alkali metals B Alkaline earth metals C Halogens D Noble gases
21 Zayn is studying the behavior of protons in an electric field. He learns that protons are deflected towards the negative plate. What does this indicate about the proton? A It has a negative charge B It has a positive charge C It is neutral D It has no mass
23 Yara is learning about radioactivity. She understands that radioactive isotopes have unstable nuclei. What type of radiation is commonly emitted by radioisotopes? A Alpha, beta, and gamma radiation B Only alpha radiation C Only beta radiation D X-rays only
24 George is learning about radioisotopes. He understands that some isotopes are used in medicine for diagnosis and treatment. Which radioisotope is commonly used in medical imaging? A Uranium-238 B Carbon-14 C Technetium-99m D Chlorine-37
25 Waseem is studying the boiling points of metals and non-metals. He knows that metals generally have high boiling points. Which of the following is a metal with a very low boiling point? A Mercury B Sodium C Iron D Gold