Atoms And Molecules Flashcards
What is an atom?
The smallest unit of an element that retains the properties of that element.
True or False: Atoms can be created and destroyed in chemical reactions.
False
Fill in the blank: The nucleus of an atom contains ______ and ______.
protons, neutrons
What charge do protons carry?
Positive charge
What is the charge of neutrons?
Neutral
Which subatomic particle determines an atom’s identity?
Protons
What is a molecule?
A group of two or more atoms bonded together.
True or False: Molecules can consist of atoms of the same element.
True
What is the chemical formula for water?
H2O
What type of bond involves the sharing of electron pairs between atoms?
Covalent bond
What is an ionic bond?
A bond formed through the transfer of electrons from one atom to another.
Fill in the blank: The number of protons in an atom is called its ______.
atomic number
Multiple choice: Which of the following is not a subatomic particle? A) Electron B) Proton C) Neutron D) Atom
D) Atom
What is the term for atoms of the same element with different numbers of neutrons?
Isotopes
True or False: All isotopes of an element have the same chemical properties.
True
What is the most abundant isotope of carbon?
Carbon-12
Fill in the blank: The region around the nucleus where electrons are likely to be found is called the ______.
electron cloud
What is the primary difference between a compound and a mixture?
A compound has a fixed ratio of elements, while a mixture does not.
Multiple choice: Which of the following is a diatomic molecule? A) O2 B) H2O C) C6H12O6 D) NaCl
A) O2
What is the main characteristic of noble gases?
They are chemically inert and have a full valence shell.
True or False: Electrons have a much greater mass than protons.
False
What determines the reactivity of an atom?
The number of electrons in the outermost shell (valence electrons).
Fill in the blank: The force that holds atoms together in a molecule is called a ______.
chemical bond
What is the term for the ability of an atom to attract electrons in a bond?
Electronegativity
What is the simplest form of matter that retains its identity?
An element
Multiple choice: Which particle is found outside the nucleus? A) Proton B) Neutron C) Electron D) All of the above
C) Electron
