Atomic Structure - test

Atoms of elements in the same group of the periodic table share the same number of energy levels number of valence electrons atomic numbers atomic masses What is an atom’s nucleus made of? protons and electrons protons and neutrons protons only neutrons only How many electrons will a neutral atom of carbon have if its nucleus has 6 protons and 8 neutrons? 2 6 8 14 An element with 5 protons, 6 neutrons, and 8 electrons has an atomic number of 5 6 8 11 An element with 5 protons, 6 neutrons, and 8 electrons has a mass number of 5 6 8 11 Atoms of the same element that have different numbers of neutrons are called molecules ions protons isotopes The total number of electrons in the outer shell of a sodium atom is 1 2 8 18 Which particles determine the atomic number of an element? Protons only Neutrons and protons Neutrons only Protons and electrons The total number of neutrons in the nucleus of any atom is equal to the mass number of the atom atomic number of the atom atomic number minus the mass number mass number minus the atomic number Two different isotopes of an element have different numbers of neutrons numbers of protons atomic numbers nothing is different about them Which of the following is a transition metal? Calcium Nickel Aluminum Chlorine An atom is neutral because neutrons balance the protons and electrons nuclear forces stabilize the charges the numbers of protons and electrons are equal the numbers of protons and neutrons are equal Which part of the periodic table indicates the number of energy levels in the electron cloud? Group Family Valence electrons period Which statement about the arrangement of the periodic table is not true? Noble gases are in the group farthest to the right Metals are found on the left side of the periodic table Rare earth elements are in the first column on the left Transition metals are in the center of the periodic table Boron, carbon, nitrogen and oxygen are all members of the same family group period valence level Which of the following elements would be the best conductor of electricity? Iodine Silicon Silver Argon Use the following clues and the periodic table to determine the identity of each element described below. This element is in the same family as Br, but has fewer protons than Mg. It must be fluorine Use the following clues and the periodic table to determine the identity of each element described below. This element has 6 energy levels and 8 valence electrons. It must be radon Use the following clues and the periodic table to determine the identity of each element described below. This element is in the alkaline earth metals group and has 3 energy levels. It must be magnesium Use the following clues and the periodic table to determine the identity of each element described below. This element is in the family with the most reactive nonmetals and has 4 energy levels. It must be potassium Fill in the missing values in the chart below Symbol Atomic Number Mass number Protons Electrons Neutrons 23Na 11 23 11 11 12 K 19 40 19 19 21 Sr 38 90 38 38 52 F 9 19 9 9 10 Ca 20 41 20 20 21 Sn 50 122 50 50 72 131 I 53 131 53 53 78 26Mg 12 26 12 12 14 Ag 47 109 47 47 62