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Chem. Review #1

False According to Dalton's atomic theory, atoms are composed of protons, electrons and neutrons.
True Atoms of elements are electrically neutral.
False The mass of an electron is equal to the mass of a neutron.
True The charge of all protons is the same.
False The atomic number of an element is the sum of the protons and electrons in the atom.
False The atomic number of an element is the whole number that decreases as you read across each row of the periodic table from left to right.
False Every atom of nitrogen has 7 protons and 7 neutrons.
True Relative atomic masses are measured in atomic mass units or amu's.
True The number of neutrons in the nucleus can be calculated by subracting the atomic number from the mass number.
True Radiations decreases with distance between you and the source.
False Noble gases are found in Group VII A.
True A row on the periodic table is called a Period or Series.
True Moseley created the arangement of our modern periodic table
False Iron is an example of an Alkali metal.
True Nonmetals gain electrons to become negative ions.
False Ions are formed by changing the number of neutrons.
False The sun is an example of nuclear fission.
False The nucleus of an atom has a positive charge, high mass and low density - often referred to as marble at the center of a football field.
Created by: FaithRaquel2015



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