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- 1. Multiple ChoiceWhich phrase describes an atom?
a positively charged electron cloud surrounding a positively charged nucleusa positively charged electron cloud surrounding a negatively charged nucleusa negatively charged electron cloud surrounding a positively charged nucleusa negatively charged electron cloud surrounding a negatively charged nucleus - 2. Multiple ChoiceWhich statement concerning elements is true?Different elements must have different numbers of isotopes.Different elements must have different numbers of neutrons.All atoms of a given element must have the same atomic number.All atoms of a given element must have the same mass number.
- 3. Multiple ChoiceIf the atomic mass number of an atom is 35, which statement is most accurate?The atom is not an isotope.The atomic number is less than 17.The atom has an odd number of neutrons.The number of protons does not equal the number of neutrons.
- 4. Multiple ChoiceHow many protons does an atom with an atomic number of 23 and a mass number of 51 have?23512874
- 5. Multiple ChoiceWhich of the following determines the identity of an element?overall chargeatomic massmass numberatomic number
- 6. Multiple ChoiceIsotopes exist because atoms of the same element can have different numbers ofprotons.electrons.neutrons.None of the options apply.
- 7. Multiple ChoiceWhich total mass is the smallest?the mass of 2 electronsthe mass of 2 neutronsthe mass of 1 electron plus the mass of 1 protonthe mass of 1 neutron plus the mass of 1 electron
- 8. Multiple ChoiceAn atom is electrically neutral because thenumber of protons equals the number of electronsnumber of protons equals the number of neutronsnumber of neutrons are greater than protons plus electronsratio of the number of neutrons to the number of electrons is 1:1
- 9. Multiple ChoiceA particle of an atom contains 26 protons, 23 electrons, and 56 neutrons. What will be the correct atomic number for this particle?26233356
- 10. Multiple ChoiceWhich element could have a mass number of 86 atomic mass units and 49 neutrons in its nucleus?InRbRnAu
- 11. Multiple ChoiceAn atom consists of a nucleus surrounded byions.protons.neutrons.electrons.
- 12. Multiple ChoiceA neutral atom is best described as havingmore protons than neutrons.more electrons than protons.an equal number of protons and neutrons.an equal number of protons and electrons.
- 13. Multiple ChoiceWhich list describes the particles that make up an atom?nucleus, electrons, and quarksprotons, neutron, and electronsionic bonds, covalent bonds, and ionsnucleus, electron cloud, and energy levels
- 14. Multiple ChoiceAn atom would lose the least amount of mass if it losta proton.a neutron.a nucleus.an electron.
- 15. Multiple ChoiceAll atoms of an element have in their nuclei the
same number ofelectrons.isotopes.molecules.protons. - 16. Multiple ChoiceManganese has an atomic number of 25
and an atomic mass of 55 amu. How
many particles are found in its nucleus?25305580 - 17. Multiple ChoiceIn which pair of atoms do the nuclei contain the same number of neutrons?Calcium-40 and Calcium-42Bromine-83 and Krypton-83Chlorine-35 and Sulfur-34Iodine-127 and Bromine-80
- 18. Multiple ChoiceThe total number of electrons found in the electron configuration of a neutral chromium atom is2461352
- 19. Multiple ChoiceWhat is the total number of electrons in a Cr3+ ion?3212427
- 20. Multiple Choice
What element is represented by this diagram?SodiumCarbonNitrogenFluorine - 21. Multiple ChoiceAn atom of tin has an atomic number of 50
and a mass number of 119. How many protons,
electrons, and neutrons are found in one neutral atom of tin?50 protons, 69 electrons, 50 neutrons50 protons, 50 electrons, 69 neutrons69 protons, 50 electrons, 69 neutrons69 protons, 69 electrons, 50 neutrons - 22. Multiple ChoiceWhich of the following correctly lists the elemental symbols for sodium, nitrogen, potassium and lead; respectively.Na, Ni, K, LdNa, Ni, Po, PbNa, N, K, PbN, Na, K, Ld
- 23. Multiple ChoiceHow is the mass of an atom calculated?add the number of protons to the number of electronsadd the number of protons to the number of neutronssubtract the number of protons from the number of neutronssubtract the number of electrons from the sum of protons and neutrons
- 24. Multiple ChoiceThe atoms in a column of the periodic table all haveThe same abbreviationThe same number of energy levelsThe same number of electronsThe same number of electrons in the outer energy level
- 25. Multiple ChoiceThe atomic number of nitrogen is 7. 01.
The atomic mass is 14. This means thatA small percentage of nitrogen atoms have more than 7 neutronsAll nitrogen atoms have exactly 7 neutrons.A small percentage of nitrogen atoms have fewer than 7 neutronsSome nitrogen atoms have fewer than 7 electrons - 26. Multiple ChoiceThe atoms of the same element can have different isotopes. An isotope of an atomIs an atom with a different number of protonsIs an atom with a different number of neutronsIs an atom with a different number of electronsHas a different atomic number
- 27. Multiple ChoiceCobalt has an atomic mass of 59 and an atomic number of 27. What does this information reveal about most cobalt atoms?They contain more neutron than protonsThey naturally have a net negative chargeThey attract protons more strongly than electronsThey form ions with a charge of +27 in compounds
- 28. Multiple ChoiceA substance that cannot be broken down into a simpler form by ordinary chemical means is called a(n)SubstanceElementAtomMatter
- 29. Multiple ChoiceIf an atom has five protons and four electrons, the atom isneutral.radioactive.negatively charged.positively charged.
- 30. Multiple ChoiceElements are identified by their atomic number becausethe mass of an element changes over time.the number of protons remains constant.atoms of the same element have different numbers of neutrons.elements in a group react in a similar way.
- 31. Multiple ChoiceIn an atom, the electrons can be foundorbiting the nucleus.inside the nucleus.bonded to the protons.bonded to the neutrons.
- 32. Multiple ChoiceThe element with the smallest atomic numberHeliumHalogenHopeHydrogen
- 33. Multiple ChoiceIn a Lewis dot diagram, the electrons shownAre in the innermost energy levelAlways equal the number of protonsAre in the outermost energy levelAlways add up to an even number
- 34. Multiple ChoiceWhich is the correct electron dot structure for the element Fluorine (F)?ABCD
- 35. Multiple ChoiceThe diagram shows a Bohr model of an atom of nitrogen. According to the model, how many valence electrons does the atom have?25714
- 36. Multiple ChoiceNitrogen has one more valence electron than carbon has. What can you infer about nitrogen’s location on the periodic table?A Nitrogen is in the first group.Nitrogen and carbon are in different groups.Nitrogen is directly above carbon but within the same group.Nitrogen is directly below carbon but within the same group.
- 37. Multiple ChoiceThe image shows a section of the periodic table of the elements. Each atom of sulfur (S) has 6 valence electrons. Which of these elements also has 6 valence electrons?oxygen (O)chlorine (Cl)bromine (Br)phosphorus (P)
- 38. Multiple ChoiceThe image shown is that the Bohr model for a neutral of atom chlorine. What details from this image supports this statement?There are 17 protons in the nucleus.The atomic mass is 35.The number of electrons is equal to protons.There is no charge shown.
- 39. Multiple ChoiceThe Bohr model shown represents a neutral atom in what group on the periodic table?13511
- 40. Multiple ChoiceWhat neutral element is represented in the Bohr model shown?SiliconMagnesiumAluminumGallium
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