36. Why are atoms electrically neutral? * a. They have the same number of protons and neutrons which are both found inside the nucleus. b. They have the same number of protons and electrons which are both found inside the nucleus. C. They have the same number of protons and electrons which are both found outside the nucleus of an atom. d. The number of protons inside the nucleus is equal to the number of electrons outside the nucleus of an atom. 37. Lithium has an atomic mass of 3 and atomic number 1. How many protons and neutrons does Lithium have? * a. 1 proton and 2 neutrons b. 2 protons and 1 neutron C. 3 protons and 1 neutron d. 3 protons and 4 neutrons 38. lonization energy can be used to predict the formation of ions. Which among the following elements do not form ions? * а. Al b. o С. СI d. Ne 39. How many neutrons does aluminum have? * 13 Al 26.98 Aluminum а. 11 b. 12 С. 14 d. 27 40. The image below are isotopes of carbon. They have the same atomic number but different atomic mass. Their difference in atomic mass is due to the different number of? * 12 14 C. a. Proton b. Neutron C. Electron d. Energy levels

36. Why are atoms electrically neutral? * a. They have the same number of protons and neutrons which are both found inside the nucleus. b. They have the same number of protons and electrons which are both found inside the nucleus. C. They have the same number of protons and electrons which are both found outside the nucleus of an atom. d. The number of protons inside the nucleus is equal to the number of electrons outside the nucleus of an atom. 37. Lithium has an atomic mass of 3 and atomic number 1. How many protons and neutrons does Lithium have? * a. 1 proton and 2 neutrons b. 2 protons and 1 neutron C. 3 protons and 1 neutron d. 3 protons and 4 neutrons 38. lonization energy can be used to predict the formation of ions. Which among the following elements do not form ions? * а. Al b. o С. СI d. Ne 39. How many neutrons does aluminum have? * 13 Al 26.98 Aluminum а. 11 b. 12 С. 14 d. 27 40. The image below are isotopes of carbon. They have the same atomic number but different atomic mass. Their difference in atomic mass is due to the different number of? * 12 14 C. a. Proton b. Neutron C. Electron d. Energy levels

Chemistry In Focus

7th Edition

ISBN:9781337399692

Author:Tro, Nivaldo J.

Publisher:Tro, Nivaldo J.

Chapter3: Atoms And Elements

Section: Chapter Questions

Problem 1SC: Your friend tells you about an article that he read in a tabloid that reported the discovery of a...

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Your friend tells you about an article that he read in a tabloid that reported the discovery of a new form of carbon containing eight protons in the nucleus of its atoms. He claims that scientists are eager to explore the properties of this new form of carbon. What is wrong with the tabloid's claim? a. Nothing. The claim is believable. b. The claim must be false because an atom with eight protons would be oxygen, which is already known. c. The claim must be false because all forms of carbon are already known.
Do the proton and the neutron have exactly the same mass? How do the masses of the proton and the neutron compare to the mass of the electron? Which particles make the greatest contribution W the mass of an atom? Which particles make the greatest contribution to the chemical properties of an atom?
A atom becomes an ion that possesses a negative charge. The atom must have: a.gained protons. b.lost protons. c.lost electrons. d.gained electrons.
Which of tire following explain how an ion is formed'? Explain your answer. a. adding or subtracting protons to/from an atom b. adding or subtracting neutrons to/from an atom c. adding or subtracting electrons to/from an atom
According to Rutherfords model of the atom, how many electrons would be found in each of the following atoms? a. sodium, which has 11 protons in its nucleus b. calcium, which has 20 protons in its nucleus
2.85 Describe how the saying “opposites attract” corresponds with the mathematical representation of Coulomb’s law shown in Equation 2.1. Remember that attractive forces have negative values and repulsive forces have positive values.
We have seen that the reactivity of an element is determined by its electron configuration. What is the electron configuration of the ion Cl-? (Hint: You must add one additional electron beyond the number of electrons that chlorine would normally have.) How does its reactivity compare with neutral Cl? How would the reactivities of Na and Na+ compare?
Calculating Atomic Mass Magnesium has three naturally occurring isotopes with masses 23.99,24.99,and25.98amu and natural abundances 78.99,10.00,and11.01%. Calculate the atomic mass of magnesium.
A fundamental idea of Daltons atomic theory is that atoms of an element can be neither created nor destroyed. We now know that this is not always true. Specifically, it is not true for uranium and lead atoms as they appear in nature. Are the numbers of these atoms increasing or decreasing? Explain.
Complete the following table. Atom/Ion Protons Neutrons Electrons S50120n M1225g2+ F2656e2+ S3479e C1735l C2963u
Certain elements have special affinities for other elements. This causes them to bind together in special ways to form .
How many valence electrons are in each element of problem 28?