Ag hg si ne s metals metalloids semimetals nonmetals

This preview shows page 8 - 11 out of 23 pages.

Ag Hg Si Ne S Metals Metalloids (semimetals) Nonmetals
2/26/2019 Ch 4 HW 9/23 ANSWER: Correct Atomic Structure and Properties of Subatomic Particles Atoms contain three subatomic particles: protons , electrons , and neutrons . The figure of a neutral atom shown color-codes each particle for visibility. Part A Reset Help Help Reset Ag S Si Hg Ne Solids Liquids Gases
2/26/2019 Ch 4 HW The diagram of a lithium atom is shown in Figure 1. Sort each of the items into the appropriate bin using the diagram of a neutral lithium atom for reference. Drag each item to the appropriate bin. Hint 1. How to approach the problem By knowing the location of each subatomic particle in an atom, you can narrow down which particle should be labeled as an electron, which particle should be labeled as a proton, and which particle should be labeled as a neutron. Since two of the particles occur in the same location within the atom, you will need to compare the numbers of each particle to determine the appropriate label for each particle. Keep in mind that neutral atoms have the same number of protons and electrons. Most of an atom's mass (at least 99.9 ) is contained in the nucleus of the atom; therefore, the particles located in the nucleus of the atom contribute most of the mass of an atom. Hint 2. Conclusions about atomic structure from Rutherford's experiment In 1909, Ernest Rutherford conducted an experiment to attempt to confirm the plum pudding model of atomic structure proposed by J. J. Thomson. Rutherford's gold foil experiment, however, proved Thomson's plum pudding model to be false. Rutherford's experiment led him to make several conclusions about atomic structure, some of which are listed here: Most of the atom’s mass and all of its positive charge are contained in a small core called the nucleus. Most of the volume of the atom is empty space through which the tiny, negatively charged particles are dispersed. Hint 3. Determine the number of protons and electrons How many protons does a lithium atom contain? Express your answer as an integer. Hint 1. How to determine the number of protons In the periodic table , you will find an integer, called the atomic number, written above the symbol for each element. The atomic number, which is unique to each element, indicates the number of protons in an atom of that element.
10/23

  • Left Quote Icon

    Student Picture

  • Left Quote Icon

    Student Picture

  • Left Quote Icon

    Student Picture