Dis the correct answer How are lons formed from atoms? A. Atoms either lose protons, forming lons with positive charges. or gain protons, forming ions with negative charges. B. Aloms either lose neutrons, forming ions with negative charges, or gain neutrons. forming ions with positive charges. C. Atoms elther lose electrons, forming lons with negative charges, or gain electrons. forming ions with positive charges. D. Aloms elther lose electrons, forming ions with positive charges. or gain electrons. forming ions with negative charges. 10. 11. B is the correct answer It you add an additional neutron to an atom, what do you create? A. a new element B. an isotope C. a reaction D. an ion Which element behaves the MOST like calcium and why? A. K. because it is in the same period and only has one less valence electron. B. Ba, because it is in the same group and has same number of valence electrons. C. Br, because it is in the same period and has more valance electrons. D. Sc. because it is in the same period and has one more valence electron. 12. 13.

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Atomic Number

Elements are the building blocks of all the matter that exist in the universe. Every element is made up of atoms that have protons, electrons, and a nucleus. In order to know the difference between the elements, an atomic number is used. Every element has its own individual atomic number. The atomic number is a single most important characteristic of an atom.