If the atomic mass for thallium on the periodic table is 204.38, are there more atoms of 203 Tl or 205 T1 in a sample of thallium? Match the words in the left column to the appropriate blanks in the sentences on the right. 81 closer to more atoms of 205 TI 81 farther from equal atoms of 21 Tl and 205 Tl 81 81 more atoms of T There are 204.38amu, is Reset Help in a sample of thallium because the mass number of thallium, which is the mass number of the isotope present in the highest percentage.

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Atoms and Molecules

An atom is the smallest unit of an element that possesses all the properties of that particular element. Molecules are the smallest unit of a substance that possess all the properties of that particular substance.