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- Multiple ChoicePlease save your changes before editing any questions.How many protons and electrons are in a copper (II) ion with a mass of 64?27 protons, 29 electrons27 protons, 31 electrons29 protons, 27 electrons29 protons, 31 electrons
- Multiple ChoicePlease save your changes before editing any questions.What is the name of the compound with the chemical formula CrCl3?chromium tetrachloridechromium trichloridechromium (II) chloridechromium (III) chloride
- Multiple ChoicePlease save your changes before editing any questions.If two oxygen atoms combine to make a molecule, what type of bond will they form?an ionic bonda hydrogen bonda metallic bonda covalent bond
- Multiple ChoicePlease save your changes before editing any questions.How does an S-2 ion differ from an electrically neutral sulfur atom?mass numberatomic numbernuclear chargenumber of electrons
- Multiple ChoicePlease save your changes before editing any questions.
Which element contains 3 valence electrons?heliumlithiumberylliumboron - Multiple ChoicePlease save your changes before editing any questions.What do the ions K+, Ca+2, and Cl- have in common?They have the same number of protonsThey will form covalent bonds with oxygenThey have the same electron configuration as argonThey are larger than their corresponding atoms
- Multiple ChoicePlease save your changes before editing any questions.What is the correct chemical formula for sodium sulfate?NaSO4Na2SO4Na(SO4)2Na2(SO4)2
- Multiple ChoicePlease save your changes before editing any questions.Which element is located in Group 2 and Period 6 of the periodic table?BaMoRaW
- Multiple ChoicePlease save your changes before editing any questions.What compound has the chemical formula MgI2?di-iodide magnesiumiodide (II) magnesiummagnesium (II) iodidemagnesium iodide
- Multiple ChoicePlease save your changes before editing any questions.The below information represents the melting point of several substances.
SUBSTANCE MELTING PT (oC)
Cl2 -101.5
Na 97.72
NaCl 801
What best explains the high melting point of salt?The strong electrostatic attraction between a sodium atom and chlorine atomThe strong electrostatic attraction between a sodium cation and chlorine anionThe strong electrostatic attraction between a sodium anion and a chlorine cationThe strong bond formed when electrons are shared between a sodium atom and a chlorine atom - Multiple ChoicePlease save your changes before editing any questions.In which block does an element with the electron configuration [Xe} 6s24f145d106p1 belong?s blockp blockd blockf block
- Multiple ChoicePlease save your changes before editing any questions.A scientist hypothesizes that a colorless gas produced during a chemical reaction is carbon dioxide. Which observation would confirm this hypothesis?The gas will react violentlyA glowing splint placed in the gas will burn brighterA burning splint will "bark"A burning splint will go out
- Multiple ChoicePlease save your changes before editing any questions.Which of these elements has the smallest atomic radius?Berylliumoxygensodiumsulfur
- Multiple ChoicePlease save your changes before editing any questions.An atom contains 70 protons, 70 electrons, and 99 neutrons. What is the mass number?23916914070
- Multiple ChoicePlease save your changes before editing any questions.Which of the following particles has a positive one charge(+1) ?protonelectronneutronbeta particle
- Multiple ChoicePlease save your changes before editing any questions.According to the periodic table, Mg will most likely react with elements in which of these groups?121718
- Multiple ChoicePlease save your changes before editing any questions.Which of the following shows the correct number of atoms of each element in the formula Mg(NO3)2?Mg = 1, N = 2, O = 5Mg = 1, N = 1, O = 6Mg = 1, N = 2, O = 6Mg = 2, N = 2, O = 6
- Multiple ChoicePlease save your changes before editing any questions.Which of these compounds is most likely to contain an ionic bond?H2CO2PCl5CaO