homework 2 Atom Components and Chemical Symbols 5 of 26 A Review Constants Periodic Table ( Mass Particle Atomic masa Electrical charge Relative units (C) charge lectron 9.109 x 100.0005486 -1.602 x 10-19 1 proton 1.673 x 10-24 1.007276 +1.002 x 10 +1 noutron 1.675 X 10- 1.008665 0 0 Learning Goal: To understand the composition of the stom Atoms are composed of electrons, neurons, and, protons. Their properties are shown in the table the right Electrons are the lightest of these two subatomic particis. Electrons have a mass of 9.100 x 10 which is about 0.05% that of the masses of protons and neutrons, and are assigned -1 charge Electrons are distributed outside the nucleus of anatom. Note that despite the popular model glectrons do not orbital fixed distance from the center of an atom. Rather, they reside within an election cloud as shown in the figure. Figure 1) Figure of 2) The atomic number is the number of protons in the nucleus of an atom of an element Each element has a unique number of protons. For example, an atom with 47 protons is always a silver atom and has anatomicrumber of 47. The stomie number is used to distinguish different elements from one another The mass number A is the sum of the number of protons and neutrons in the nucleus of an atom of an element. Atoms that have the same atomic number but different mass numbers are called slopes. For example, atoms with loc number are carbon atoms, but carbon atoms with mass numbers of 12 and 13 are isotopes of one another Each element is assigned a unique chemical symbol. For example, the symbol for hydrogen is H, and the mood for anym 10. Some elements have symbols based on their names in languages other than English For example, the symbol for iron is Fe, which is based on the Latin Vr The atomic number, mass number and chemical symbol are often combined to describe a givenutorn For example, anatom of tum (La) with atomic number 3 and a mass number of 7 could be written Li. Since the atomic number and the symbol are both unique to a given element, the atomic number is often loft off of this rotation, leaving electi 5 of 20 Atom Components and Chemical Symbols PERUSTV 9.109 x 10 g, which is about 0.05% that of the masses of protons and neutrons, and are assigned - 1 charge. Electrons are distributed outside the nucleus of an atom. Note that, despite the popular model, electrons do not orbit at fixed distance from the center of an atom. Rather, they reside within an electron cloud as shown in the ligure. Figure 1) Except for nuclear chemistry, all chemistry involves the distribution of electrons among different toms of compounds Protons have a mass of 1.673 10-Protons are assigned a charge The third subatomic particle is the neutron Neutrons have approximately the same massas protons, but they do not have a charge. Along with petons, neutron comprise the nucleus at the center of an atom (Figure 2) Review Constants Periodic Table them to US SUURUS U OF CHO of protons. For example, an atom with 47 protons is always a silver atom and has an atomic number of 47 The womic number is used to distinguish different elements from one another The mass number in the sum of the number of protons and neutrons in the nucleus of an atom of an element. Atoms that have the same atomic number but different mass numbers we called solopes. For example, all soms with atomic number 6 are carbon atoms, but carbon Moms with mass numbers of 12 and 13 are isotopes of one another Each element is assigned a unique chemical symbol. For example, the symbol for hydrogen is H. and the symbol for Gwygen is O. Some elements have symbols based on their names in languages other than English. For example, the symbol for iron is Fe, which is based on the Latin forum The atomic number, mass number and chemical symbol are often combined to describe a given atom. For example, anatom of lithium (L.) with atomic number 3 and a mass number of 7 could be written Lil Since the atomic number and the symbol are both unique to a given element, the atomic number is then left off of this notation, leaving 'La Part A Figure 1 of 2 Which subatomic particles) are found in the nucleus of the atom? Enter the subatomic particle or particles separated by commas. econdo Submit Recuest Answer Part B