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Questions and Answers
Which subatomic particle primarily dictates the chemical properties of an atom?
Which subatomic particle primarily dictates the chemical properties of an atom?
In the Bohr model of the atom, what determines the energy level of an electron?
In the Bohr model of the atom, what determines the energy level of an electron?
Which of the following best describes a covalent bond?
Which of the following best describes a covalent bond?
As you move down a column (group) in the periodic table, what generally happens to the reactivity of metallic elements?
As you move down a column (group) in the periodic table, what generally happens to the reactivity of metallic elements?
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What does the subscript number '2' indicate in the chemical formula $H_2O$?
What does the subscript number '2' indicate in the chemical formula $H_2O$?
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Study Notes
Subatomic Structure
- Atoms are composed of protons, neutrons, and electrons.
- Protons and neutrons reside in the nucleus.
- Electrons occupy orbitals.
- Bohr model illustrates electron arrangement in energy levels.
- Lewis dot structures represent valence electrons.
Classifying Matter
- Elements are pure substances containing only one type of atom.
- Compounds are pure substances composed of two or more different elements chemically bonded.
- Mixtures are combinations of two or more pure substances (elements or compounds) not chemically bonded.
- Atoms are single individual units of elements.
- Molecules are groups of two or more atoms bonded together.
Periodic Table
- The periodic table organizes elements by atomic number and properties.
- Each element box shows:
- Atomic number (number of protons)
- Atomic mass (average mass of isotopes)
- Chemical symbol (abbreviation)
- Properties of elements change across rows (periods) and down columns (groups).
- Metal, nonmetal, and noble gas elements exhibit predictable reactivity patterns.
Bonding
- Ionic bonds form when atoms transfer electrons.
- Covalent bonds form when atoms share electrons.
Chemical Formulas
- Subscripts in chemical formulas indicate the number of each type of atom in a molecule or compound.
- Coefficients in chemical equations balance the number of atoms of each element on both sides of the reaction.
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Description
This quiz focuses on the subatomic structure of atoms, the classification of matter, and the organization of the periodic table. Test your understanding of protons, neutrons, electrons, elements, compounds, and mixtures, along with their representations and properties. Dive into the foundational concepts that shape modern chemistry.
