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Mastering Biology2

Chapter 2

QuestionAnswer
In the term trace element, the adjective trace means that the element is required in very small amounts.
Compared with 31^P, the radioactive isotope 32^P has one more neutron
The reactivity of an atom arises from the existence of unpaired electrons in the valence shell
We can represent atoms by listing the number of protons, neutrons, and electrons-for example, 2p+, 2n0, 2e- for helium. What represents the 18^O isotope of oxygen? 8p+, 10n0, 8e-
The atomic number of sulfur is 16. Sulfur combines with hydrogen by covalent bonding to form a compound, hydrogen sulfide. Based on the number of valence electrons in a sulfur atom, predict the molecular formula of the compound. H_2S
Which statement is true of all atoms that are anions? The atom has more electrons than protons
Created by: Celly