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Part 2. Complete the empty cells/boxes in the table. Atomic Number Number Mass Electrons protons Neutrons (p') Element Element Symbol (e') (n이 (Z) (A) 1. Sodium Na 11 23 11 11 12 2. Hydrogen 1 1 3. Calcium Ca 20 40 4. Cobalt Co 27 59 5. Magnesium Mg 12 24

Part 2. Complete the empty cells/boxes in the table. Atomic Number Number Mass Electrons protons Neutrons (p') Element Element Symbol (e') (n이 (Z) (A) 1. Sodium Na 11 23 11 11 12 2. Hydrogen 1 1 3. Calcium Ca 20 40 4. Cobalt Co 27 59 5. Magnesium Mg 12 24

Chemistry: The Molecular Science
Chemistry: The Molecular Science
5th Edition
ISBN:9781285199047
Author:John W. Moore, Conrad L. Stanitski
Publisher:John W. Moore, Conrad L. Stanitski
Chapter1: The Nature Of Chemistry
Section1.13: The Periodic Table
Problem 1.9E
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What is in a Number? Activity 4. (Adapted from Grade 8 Science Learner's Module) ОВJЕСTIVE: Determine the number of electrons, protons, and neutrons in an atom. DIRECTION: Read the selection carefully then complete the table afterwards. ---- --- .--- ---- Elements are given letter symbols including their atomic number and mass. The mass number (A) is written on the upper portion beside the symbol (X), while i the atomic number (Z) is written below the mass number. X: mass number A + atomic symbol of element atomic number Figure 1. An atomik symbol with its atomic number and mass. The number of protons in an atom is called the atomic number of an element. A neutral atom holds an equal number of protons and electrons. The I atomic number also indicates the number of electrons in that atom. Meanwhile, ! the mass number is the sum or the total number of protons and neutrons in I an atom. F To illustrate further, see the symbol for identifying the fluorine atom. With an atomic number of 9, fluorine has 9 protons. Since the 19 number of protons must be the same as the number of electrons, it has also 9 electrons. How many neutrons does it have? To compute for the number of neutrons, subtract the atomic number from the mass number (19-9). Therefore, fluorine has 10 neutrons. Always remember that for a neutral atom, atomic number (Z) = number of electrons = number of protons mass number (A) = number of protons + number of neutrons number of neutrons = mass number (A) – atomic number (Z). Now it is your turn. Determine the number of dectrons, protons, and neutrons by completing the table below. To serve as your guide, the first one is already done for you. Part 2. Complete the empty cells/boxes in the table. Atomic Mass Number Number (Z) Electrons protons Neutrons (p) Element Element Symbol (e') (nº) (A) 1. Sodium Na 11 23 11 11 12 2. Hydrogen H 1 1 3. Calcium Ca 20 40 4. Cobalt Co 27 59 5. Magnesium Mg 12 24
Transcribed Image Text:What is in a Number? Activity 4. (Adapted from Grade 8 Science Learner's Module) ОВJЕСTIVE: Determine the number of electrons, protons, and neutrons in an atom. DIRECTION: Read the selection carefully then complete the table afterwards. ---- --- .--- ---- Elements are given letter symbols including their atomic number and mass. The mass number (A) is written on the upper portion beside the symbol (X), while i the atomic number (Z) is written below the mass number. X: mass number A + atomic symbol of element atomic number Figure 1. An atomik symbol with its atomic number and mass. The number of protons in an atom is called the atomic number of an element. A neutral atom holds an equal number of protons and electrons. The I atomic number also indicates the number of electrons in that atom. Meanwhile, ! the mass number is the sum or the total number of protons and neutrons in I an atom. F To illustrate further, see the symbol for identifying the fluorine atom. With an atomic number of 9, fluorine has 9 protons. Since the 19 number of protons must be the same as the number of electrons, it has also 9 electrons. How many neutrons does it have? To compute for the number of neutrons, subtract the atomic number from the mass number (19-9). Therefore, fluorine has 10 neutrons. Always remember that for a neutral atom, atomic number (Z) = number of electrons = number of protons mass number (A) = number of protons + number of neutrons number of neutrons = mass number (A) – atomic number (Z). Now it is your turn. Determine the number of dectrons, protons, and neutrons by completing the table below. To serve as your guide, the first one is already done for you. Part 2. Complete the empty cells/boxes in the table. Atomic Mass Number Number (Z) Electrons protons Neutrons (p) Element Element Symbol (e') (nº) (A) 1. Sodium Na 11 23 11 11 12 2. Hydrogen H 1 1 3. Calcium Ca 20 40 4. Cobalt Co 27 59 5. Magnesium Mg 12 24
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