What is true about protons within an atom? Select all that apply.
O They are negatively charged.
O They are equal to the atomic mass.
O They are equal to the atomic number.
O They are positively charged.

Option C and D are correct

Explanation:

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They are positively charged

Explanation:

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Electrons in an atom can shield each other from the pull of the nucleus. This effect, called the shielding effect, describes the decrease in attraction between an electron and the nucleus in any atom with more than one electron shell. ... The more shielding that occurs, the further the valence shell can spread out.