![]() ![]() carbon, average The atomic mass unit _.Ĭ) is based on the mass of an atom of ^12(sub6)CĮ) is based on the mass of a hydrogen atom, which contains only 1 proton c) is based on the mass of an atom of ^12(sub6)Cĭ) is often abbreviated as amu Thomson's experiments with cathode rays determined that atoms contained even smaller particles called _, which have a _ charge.ĭ) protons positive a) electrons negative Which of the following options correctly describe Dalton's atomic theory? Select all that apply.Ī) Atoms combine randomly to form a given compound.ī) Atoms of the same element are identical.ĭ) Atoms of one element can be converted into atoms of another element.Į) Compounds result from the combination of a specific ratio of atoms of different elements. The atomic mass (weight) of any element is determined relative to this standard and is not a whole number, since it is a(n) _ of the masses of its naturally occurring isotopes. interval The atomic mass unit is defined as _.ĭ) 1/12 the mass of an average carbon atom a) 1/12 the mass of a carbon-12 atom The atomic mass unit is a standardized unit defined as exactly 1/12 the mass of a(n) _-12 atom. gold, alpha The _ number of an atom is equal to the sum of the protons and _ in the nucleus of the atom.ĭ) atomic electrons a) mass neutrons The atomic-mass _ is used to define the atomic mass of elements that have very large variations in isotopic composition depending on their source. The pathway of these particles was tracked by allowing them to strike a zinc-sulfide screen after interacting with the foil. created, specific Rutherford's famous experiment involved bombarding a piece of _ foil with _ particles, which were known to be heavy and positively charged. Since each type of atom has its own _ atomic mass, the total mass cannot change in a chemical reaction. This observation is reflected in Dalton's postulate that atoms cannot be _ or destroyed, or changed into other types of atoms. The most abundant is ^202(sub80)Hg, which has _ protons, _ electrons, and _ neutrons.Į) 202 202 122 b) 80 80 122 Match each component of the atom with the correct description.ī) Uncharged dense particle located in the center of the atomĬ) Positively charged particle found within the center of the atomĭ) Small region that contains almost all of the mass of an atom d, a, c, b Mass is conserved in a chemical reaction. This is because isotopes have the same number of protons but a different number of _.ĭ) mass atomic electrons a) atomic mass neutrons Match each of the following experiments/observations with the information it contributed to the nuclear model of the atom.ġ) Thomson's experiments with cathode raysĪ) The determination of the charge on a single electronī) The discovery that atoms can be divided into smaller particlesĬ) The discovery of the nucleus of the atom b, a, c Mercury has seven stable isotopes. atomic, mass Isotopes are atoms of the same element that have the same _ number but a different _ number. The _ number, given by the symbol Z, is written as a left subscript while the _ number, given by the symbol A, is written as a left superscript next to the atomic symbol. ![]() It is common to represent an element using its atomic symbol, which is an abbreviation based on its name. ![]() ![]() d) A given compound always contains a fixed ratio of its component elements. Match each component of this symbol with its correct meaning.Ī) Mass number: the total number of protons and neutrons in the nucleusī) Atomic number: the number of protons in the nucleusĬ) Atomic symbol: the element symbol found in the periodic table b, a, c How does Dalton's atomic theory account for the fact that different samples of the same compound always contain a fixed mass percentage of its component elements?Ī) A particular group of elements always combines in the same ratio to form a compound.ī) The ratio of the atoms in a given compound varies, but the total mass of the compound remains the same.Ĭ) All the atoms of a given compound have the same mass.ĭ) A given compound always contains a fixed ratio of its component elements. protons, electrons Each element can be represented by an atomic symbol with the format ^A(subZ)X. For an electrically neutral atom, this number is also equal to the number of _ present. Each element has a unique number of _, which is called the atomic number. ![]()
0 Comments
Leave a Reply. |
Details
AuthorWrite something about yourself. No need to be fancy, just an overview. ArchivesCategories |