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Questions and Answers
What is the mass number of an atom with 15 protons and 16 neutrons?
What is the mass number of an atom with 15 protons and 16 neutrons?
- 32
- 31 (correct)
- 15
- 16
Which of the following statements accurately describes isotopes?
Which of the following statements accurately describes isotopes?
- Isotopes are atoms of different elements that have the same number of protons.
- Isotopes are atoms of the same element that have the same number of protons and neutrons.
- Isotopes are atoms of the same element that have the same number of protons but a different number of neutrons. (correct)
- Isotopes are atoms of different elements that have the same number of neutrons but a different number of protons.
What is the atomic number of an atom with 20 protons and 22 neutrons?
What is the atomic number of an atom with 20 protons and 22 neutrons?
- 22
- 44
- 20 (correct)
- 42
What is the symbol for an isotope of oxygen with 8 protons and 10 neutrons?
What is the symbol for an isotope of oxygen with 8 protons and 10 neutrons?
Which of the following elements has 11 protons?
Which of the following elements has 11 protons?
What is the complete symbol for the Americium isotope used in smoke detectors?
What is the complete symbol for the Americium isotope used in smoke detectors?
What is the name of the element with the symbol 'He' and a mass number of 4?
What is the name of the element with the symbol 'He' and a mass number of 4?
Which of the following statements is TRUE about atomic theory?
Which of the following statements is TRUE about atomic theory?
What is the complete symbol for the Carbon isotope used for radioactive dating of previously living material?
What is the complete symbol for the Carbon isotope used for radioactive dating of previously living material?
What is the number of neutrons in an atom of chlorine (Cl) with a mass number of 37?
What is the number of neutrons in an atom of chlorine (Cl) with a mass number of 37?
Which of the following atoms has the smallest number of neutrons?
Which of the following atoms has the smallest number of neutrons?
Which of the following atoms has the largest number of protons?
Which of the following atoms has the largest number of protons?
What is the atomic symbol for sodium?
What is the atomic symbol for sodium?
What is the name of the element with the atomic symbol Mn?
What is the name of the element with the atomic symbol Mn?
Which of the following is NOT a characteristic of a molecule?
Which of the following is NOT a characteristic of a molecule?
What is the molecular formula for a molecule with two hydrogen atoms and one oxygen atom?
What is the molecular formula for a molecule with two hydrogen atoms and one oxygen atom?
What is the name of the molecule with the formula P2S5?
What is the name of the molecule with the formula P2S5?
What is the correct formula for carbon tetrachloride?
What is the correct formula for carbon tetrachloride?
Which of the following prefixes is used to indicate eight atoms in a molecule?
Which of the following prefixes is used to indicate eight atoms in a molecule?
What is the correct formula for silicon dioxide?
What is the correct formula for silicon dioxide?
If a molecule contains four atoms of a certain element, what prefix will be used in its name?
If a molecule contains four atoms of a certain element, what prefix will be used in its name?
What is the correct formula for iodine pentabromide?
What is the correct formula for iodine pentabromide?
Flashcards
Atom
Atom
The smallest piece of an element that maintains its identity.
Atomic Number
Atomic Number
The number of protons in the nucleus of an atom; unique to each element.
Isotopes
Isotopes
Atoms of the same element with different numbers of neutrons.
Mass Number
Mass Number
The sum of protons and neutrons in an atomic nucleus.
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Carbon-12
Carbon-12
An isotope of carbon with 6 protons and 6 neutrons.
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Uranium-238
Uranium-238
An isotope of uranium with 92 protons and 146 neutrons.
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Atomic Symbols
Atomic Symbols
Abbreviations used to represent elements and their isotopes.
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Neutral Atom
Neutral Atom
An atom with equal numbers of protons and electrons, overall charge is zero.
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Numerical Prefixes
Numerical Prefixes
Prefixes used to indicate the number of atoms in a molecule.
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Mono
Mono
Prefix meaning one; used for a single atom in a molecular formula.
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Di
Di
Prefix meaning two; indicates two atoms of an element.
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Tri
Tri
Prefix meaning three; indicates three atoms of an element.
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Tetra
Tetra
Prefix meaning four; indicates four atoms of an element.
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Penta
Penta
Prefix meaning five; indicates five atoms of an element.
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Chemical Nomenclature Rule 1
Chemical Nomenclature Rule 1
Identify the elements in the molecule from its formula.
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Naming the Second Element
Naming the Second Element
Combine the numerical prefix, stem, and -ide suffix for the second element.
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Molecule
Molecule
The smallest part of a substance that has its properties, made of two or more atoms.
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Molecular Formula
Molecular Formula
A formal listing of the types and numbers of atoms in a molecule.
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Chemical Bond
Chemical Bond
The connection between atoms in a molecule.
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Element Names
Element Names
The names of chemical elements represented by their symbols.
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Neutrons
Neutrons
Neutral particles in an atom's nucleus, contributing to its mass.
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Protons
Protons
Positively charged particles found in the nucleus of an atom.
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Chemistry Basic: The Atomic Theory
- Atoms are the smallest pieces of an element, maintaining its identity.
- Atoms are composed of subatomic particles.
- Modern Atomic Theory:
- All matter is composed of atoms.
- Atoms of the same element are identical, differing elements are different.
- Atoms combine in whole-number ratios to form compounds.
The Atom
- Protons: Located in the nucleus, 1.6 x 10-27 kg, positive charge (1+).
- Neutrons: Located in the nucleus, 1.6 x 10-27 kg, no charge.
- Electrons: Orbiting the nucleus, 9.1 x 10-31 kg, negative charge (1-).
Atomic Number
- The number of protons in an atom's nucleus.
- All atoms of the same element have the same number of protons.
- Atoms of the same element can have a varying number of neutrons.
Isotopes
- Atoms of the same element with a different number of neutrons.
- Mass number = sum of protons and neutrons in the nucleus.
Atomic Symbols
- Mass number (number of protons + neutrons) is shown as a superscript.
- Atomic number (number of protons) is shown as a subscript.
- Example: Carbon-12 (12C). Uranium-238 (238U).
Periodic Table of Elements
- Organises elements based on atomic number and properties.
- Elements with similar properties are grouped.
- Elements are arranged in rows (periods) and columns (groups).
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