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A certain ion X2+ contains 24 electrons and 51 neutrons. Wha…
A certain ion X2+ contains 24 electrons and 51 neutrons. What is the mass number of this ion?
An atom that has 54 protons, 54 electrons, and 78 neutrons i…
An atom that has 54 protons, 54 electrons, and 78 neutrons is _____.
The symbol Ca stands for the element
The symbol Ca stands for the element
Which of the following contains the largest number of oxygen…
Which of the following contains the largest number of oxygen atoms?
How many phosphorus atoms are represented by one formula uni…
How many phosphorus atoms are represented by one formula unit of calcium phosphate, Ca3(PO4)2?
The symbol Ni stands for the element _____.
The symbol Ni stands for the element _____.
Which of these are isotopes of hydrogen?
Which of these are isotopes of hydrogen?
Which of the following elements is most similar to chlorine?
Which of the following elements is most similar to chlorine?
How many protons, electrons, and neutrons, respectively, doe…
How many protons, electrons, and neutrons, respectively, does have?