A compound is a pure substance formed by chemically combining two or more elements together.
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Q62: Sulfur is a metal.
Q63: The farther a shell is from the
Q64: Oxygen,carbon,hydrogen,and nitrogen are called the building-block elements
Q65: Iodine has smaller ionization energy than chlorine.
Q66: The electron-dot symbol for barium is
Q68: Group 6A elements have the general electron
Q69: The electron configuration for calcium is 1s22s22p63s23p64s2.
Q70: When orbitals are equal in energy,one electron
Q71: Phosphorus has 15 valence electrons.
Q72: The 5s orbital is lower in energy
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