3. Which statement about an atom is true: A. All the elements have only one nucleon (mass) number.
B. The nucleon number can be less than the proton number.
C. The nucleon number can be equal to the proton number.
D. The number of neutrons never equals the number of electrons.
4. An element X has two isotopes, which may be represented by 238X and 235X. How does 238X
differ from 235X/
A. It has 3 more protons and 3 more electrons.
B. It has 3 more protons, but no more electrons.
C. It has 3 more neutrons and 3 more electrons.
D. It has 3 more neutrons, but no more electrons.

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that's what i got you can count the number of atoms

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the term hydride is commonly named after binary compounds that hydrogen forms with other elements of the periodic table. hydride compounds in general form with almost any element, except a few noble gases. the trends and properties vary according to the type of intermolecular force that bonds the elements together, the temperature, its molecular masses, and other components. hydrides are classified into three major groups, depending on what elements the hydrogen bonds to. the three major groups are covalent, ionic, and metallic hydrides. formally, hydride is known as the negative ion of a hydrogen, h-, also called a hydride ion. because of this negative charge, hydrides have reducing, or basic properties. its special characteristics will be further discussed.

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