Physics

Physics, 11.09.2019 05:30, SKYBLUE1015

Which of the following statements is/are correct? 1. atoms are the smallest particles of an element that retain the element's chemical properties. 2. substances composed of only one type of atom are classified as elements. 3. of the 118 known elements, only 48 occur naturally.

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Chemistry, 24.06.2019 15:30, hapjajsjjz3738

The existence of isotopes violates one of the original ideas of dalton's atomic theory. which one? matter is composed of exceedingly small particles called atoms. an atom is the smallest unit of an element that can participate in a chemical change. an element consists of only one type of atom, which has a mass that is characteristic of the element and is the same for all atoms of that element. atoms of one element differ in properties from atoms of all other elements. a compound consists of atoms of two or more elements combined in a small, whole-number ratio. in a given compound, the numbers of atoms of each of its elements are always present in the same ratio. atoms are neither created nor destroyed during a chemical change, but are instead rearranged to yield substances that are different from those present before the change.

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Physics, 27.06.2019 14:00, julialombardo53

Which of these statements correctly describe the atom? check all that apply. all matter on earth is made up of atoms. the subatomic particles of an element retain the properties of that element. the neutron has no charge and identifies the element. the electron is negatively charged and is located in a cloud surrounding the nucleus. the proton is positively charged and is found in the nucleus.

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Chemistry, 27.06.2019 23:00, jinxjungkook3

Which of the following is a key tenet of dalton's atomic theory (click on all that apply)? (1 point) all elements are composed of tiny indivisible particles called atoms. atoms of the same element are identical. the atoms of any one element are different from those of any other element atoms of different elements can physically mix together or can chemically combine to form compounds chemical reactions occur when atoms are separated from each other, joined, or rearranged in a different combination. atomic nuclei contained the negatively charges electrons. atoms retain their identity in a chemical reaction.

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Chemistry, 19.09.2019 16:20, vorhees2406

25. which one of the following is not one of the postulates of dalton's atomic theory? a) atoms are composed of protons, neutrons, and electrons. b) all atoms of a given element are identical; the atoms of different elements are different and have different properties. c) atoms of an element are not changed into different types of atoms by chemical reactions: atoms are neither created nor destroyed in chemical reactions. d) compounds are formed when atoms of more than one element combine; a given compound always has the same relative number and kind of atoms. e) each element is composed of extremely small particles called atoms.

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