Section 2 Masses of Atoms - Springfield Public SchoolsAtomic Mass The unit of measurement used for...

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Ch 19 Section 2 Masses of Atoms

Transcript of Section 2 Masses of Atoms - Springfield Public SchoolsAtomic Mass The unit of measurement used for...

Page 1: Section 2 Masses of Atoms - Springfield Public SchoolsAtomic Mass The unit of measurement used for atomic particles is the atomic mass unit (amu). The mass of a proton or a neutron

Ch 19 Section 2

Masses of Atoms

Page 2: Section 2 Masses of Atoms - Springfield Public SchoolsAtomic Mass The unit of measurement used for atomic particles is the atomic mass unit (amu). The mass of a proton or a neutron

Atomic Mass   The nucleus contains most of the mass of the atom

because protons and neutrons are far more massive than electrons.

Page 3: Section 2 Masses of Atoms - Springfield Public SchoolsAtomic Mass The unit of measurement used for atomic particles is the atomic mass unit (amu). The mass of a proton or a neutron

Atomic Mass   The unit of measurement used for atomic particles

is the atomic mass unit (amu).

  The mass of a proton or a neutron is almost equal to 1 amu.

  The atomic mass unit is defined as one-twelfth the mass of a carbon atom containing six protons and six neutrons.

Page 4: Section 2 Masses of Atoms - Springfield Public SchoolsAtomic Mass The unit of measurement used for atomic particles is the atomic mass unit (amu). The mass of a proton or a neutron

Protons Identify an Element   The number of protons tells you what type of atom

you have and vice versa.

  The number of protons in an atom is equal to a number called the atomic number.

Page 5: Section 2 Masses of Atoms - Springfield Public SchoolsAtomic Mass The unit of measurement used for atomic particles is the atomic mass unit (amu). The mass of a proton or a neutron

Mass Number   The sum of the number of protons and the number

of neutrons in the nucleus of an atom.

Page 6: Section 2 Masses of Atoms - Springfield Public SchoolsAtomic Mass The unit of measurement used for atomic particles is the atomic mass unit (amu). The mass of a proton or a neutron

Isotopes   Atoms of the same element that have different

numbers of neutrons.

  Use the name of the element followed by the mass number of the isotope to identify each isotope: boron-10 and boron-11.

Page 7: Section 2 Masses of Atoms - Springfield Public SchoolsAtomic Mass The unit of measurement used for atomic particles is the atomic mass unit (amu). The mass of a proton or a neutron

Identifying Isotopes   The average atomic mass of an element is the

weighted-average mass of the mixture of its isotopes.

  Four out of five atoms of boron are boron-11, and one out of five is boron-10.


Chapter 5 -A - Philadelphia University · 2019-03-14 · 3 DALTON (ATOMIC MASS UNIT, AMU) • Atomic and molecular weights are generally expressed in terms of atomic mass units (amu),or

Chapter 5 -A - Philadelphia University · 2019-03-14 · 3 DALTON (ATOMIC MASS UNIT, AMU) • Atomic and molecular weights are generally expressed in terms of atomic mass units (amu),or

Atomic Mass The Mole Molecular Weight Unit 8 – Chemical Quantities 1.

Atomic Mass The Mole Molecular Weight Unit 8 – Chemical Quantities 1.

The Ideal Gas Laws Chapter 14. Expectations After this chapter, students will: Know what a mole is Understand and apply atomic mass, the atomic mass unit,

The Ideal Gas Laws Chapter 14. Expectations After this chapter, students will: Know what a mole is Understand and apply atomic mass, the atomic mass unit,

Chapter 3. Atomic Mass amu = Average Atomic Mass Unit Based on 12 C as the standard. 12 C = exactly 12 amu The average atomic mass (weight) of.

Chapter 3. Atomic Mass amu = Average Atomic Mass Unit Based on 12 C as the standard. 12 C = exactly 12 amu The average atomic mass (weight) of.

AS Chemistry Edexcel Unit 1 Core Principles · PDF fileUnit 1.3 Atomic structure & the periodic table (p52 – 77 in text book) 1. Relative atomic mass The relative atomic mass of

AS Chemistry Edexcel Unit 1 Core Principles · PDF fileUnit 1.3 Atomic structure & the periodic table (p52 – 77 in text book) 1. Relative atomic mass The relative atomic mass of

Unit 5 The Mole. Molecular and Formula Mass Atomic mass unit (u) = the unit of mass for atoms Molecular mass is the sum of the masses of all atoms in.

Unit 5 The Mole. Molecular and Formula Mass Atomic mass unit (u) = the unit of mass for atoms Molecular mass is the sum of the masses of all atoms in.

*KEY* *KEY* UNIT 2 - ATOMIC THEORYpacechem.weebly.com/uploads/2/0/9/8/.../notes_-_atomic_theory_key… · 1 UNIT 2 - ATOMIC THEORY VOCABULARY: Allotrope Anion Atom Atomic Mass Atomic

*KEY* *KEY* UNIT 2 - ATOMIC THEORYpacechem.weebly.com/uploads/2/0/9/8/.../notes_-_atomic_theory_key… · 1 UNIT 2 - ATOMIC THEORY VOCABULARY: Allotrope Anion Atom Atomic Mass Atomic

UNIT 2 - ATOMIC THEORY - Winston-Salem/Forsyth · PDF file1 UNIT 2 - ATOMIC THEORY VOCABULARY: Allotrope Anion Atom Atomic Mass Atomic Mass unit (a.m.u.) Atomic number Bohr model Cation

UNIT 2 - ATOMIC THEORY - Winston-Salem/Forsyth · PDF file1 UNIT 2 - ATOMIC THEORY VOCABULARY: Allotrope Anion Atom Atomic Mass Atomic Mass unit (a.m.u.) Atomic number Bohr model Cation

UNIT I Some Basic Concepts of Chemistry 9 hrs€™s atomic theory – postulates. Atomic and molecular masses: Atomic mass, amu (value of 1amu), average atomic mass

UNIT I Some Basic Concepts of Chemistry 9 hrs€™s atomic theory – postulates. Atomic and molecular masses: Atomic mass, amu (value of 1amu), average atomic mass

Unit 3 Exam Famous scientists Periodic table arrangement Periodic Trends Atomic structure Calculations: light and atomic mass.

Unit 3 Exam Famous scientists Periodic table arrangement Periodic Trends Atomic structure Calculations: light and atomic mass.

Atomic Mass l Atoms are so small, it is difficult to discuss how much they weigh in grams. l Use atomic mass units. l an atomic mass unit (amu) is one.

Atomic Mass l Atoms are so small, it is difficult to discuss how much they weigh in grams. l Use atomic mass units. l an atomic mass unit (amu) is one.

Average Atomic Mass. carbon atom (12 amu) Measuring Atomic Mass Unit is the Atomic Mass Unit (amu) One twelfth the mass of a carbon-12 atom. Each isotope.

Average Atomic Mass. carbon atom (12 amu) Measuring Atomic Mass Unit is the Atomic Mass Unit (amu) One twelfth the mass of a carbon-12 atom. Each isotope.

CHAPTER Atomic structure and atomic mass

CHAPTER Atomic structure and atomic mass

Unit 3: Stoichiometry Part 1. Atomic Masses Atomic mass – (atomic weight) – The atomic mass of an element indicates how heavy, on average, an atom of.

Unit 3: Stoichiometry Part 1. Atomic Masses Atomic mass – (atomic weight) – The atomic mass of an element indicates how heavy, on average, an atom of.

IB Chemistry 1: Topic 2 Atomic Structure: atomic particles, atomic number, mass #, isotopes and atomic mass.

IB Chemistry 1: Topic 2 Atomic Structure: atomic particles, atomic number, mass #, isotopes and atomic mass.

5.2 The Modern Periodic Table 5-2 & 5-3 Periodic Law –How is the current periodic table organized? –Periods –Groups Atomic Mass –Atomic Mass Unit –Isotopes.

5.2 The Modern Periodic Table 5-2 & 5-3 Periodic Law –How is the current periodic table organized? –Periods –Groups Atomic Mass –Atomic Mass Unit –Isotopes.

ATOMIC MASS & AVERAGE ATOMIC MASS

ATOMIC MASS & AVERAGE ATOMIC MASS

Scandium Sc Atomic Number: 21 Atomic Mass: 44.955910 Atomic Number: 21 Atomic Mass: 44.955910.

Scandium Sc Atomic Number: 21 Atomic Mass: 44.955910 Atomic Number: 21 Atomic Mass: 44.955910.

'Atomic Mass and Atomic Number Worksheet

'Atomic Mass and Atomic Number Worksheet

Atomic mass The atomic mass is the average mass of an atom.

Atomic mass The atomic mass is the average mass of an atom.