An atomic model shows 19 protons, 20 neutrons, and 19 electrons.Question Cobalt has a mass number of 59 and an atomic number of 27. Protons and neutrons have almost the same mass. Which statement about subatomic particles is NOT true? (1 point) which of the following parts of dalton's was disproved by the discovery 1.the modern atomic model includes orbiting the nucleus.how can you determine the number of protons, electrons,neutrons, atomic number, and the atomic mass of an element using the.Science 8 A Unit 3: Matter Interactions A. The Composition of Atoms Quick Check questions and answers.(1) Which statement about the number of protons and neutrons in a nuclear change is correct?.Which statement about the number of protons and neutrons in a nuclear change is correct?(1 point).How many atoms are represented in the formula Na2HPO4?(1 point) It has the same number of atoms of each element on both sides. It has the same type of atoms on both sides. It has the same number of molecules on both sides. It has the same type of molecules on both sides. What does it mean for a chemical equation to be balanced?(1 point) According to the Law of Conservation of Matter, how many atoms of chlorine reacted with the hydrogen?(1 point) Suppose 20 atoms of hydrogen (H) react with chlorine (Cl) to produce 20 molecules of hydrochloric acid (HCl). H2O2 has the same properties as H2O and O2. The reaction creates new atoms of H2O and O2. Which statement about the reaction is correct?Ītoms of H2 and O2 are lost during the reaction. Use the chemical reaction to answer the question. Lithium atoms are created as the battery recharges. The mass of the battery increases when it is recharged.Ī new substance is formed as the battery is used.Įlectrons are lost to the environment when the battery is used. Which statement about the battery is correct?(1 point) Which option is an example of a chemical change?(1 point)Ī scientist is using a lithium ion battery to power her laptop. They are all very reactive with other elements. They all have the same number of electrons in the outer shell. Why do elements that are in the same group of the periodic table share similar properties?(1 point) They have the same number of electron shells. They have the same number of valence electrons. What do these elements have in common?(1 point) Potassium and nickel are in the same row of the periodic table. Three blue spheres and three white spheresĪ ball-and-stick model of a molecule of formaldehyde, CH2O, is made from the following components: Which option correctly describes a model of ammonia, NH3?(1 point) To create a molecular model, a student will use blue spheres to represent nitrogen (N) and white spheres to represent hydrogen (H). What is the mass number of the atom?(1 point) An atomic model shows 19 protons, 20 neutrons, and 19 electrons.
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