Atom Flashcards
What is the smallest unit of an element?
An atom.
True or False: All atoms of a given element have the same number of protons.
True.
Fill in the blank: The center of an atom is called the _____.
nucleus.
What particles are found in the nucleus of an atom?
Protons and neutrons.
What is the charge of a proton?
Positive.
What is the charge of a neutron?
Neutral.
Multiple Choice: Which particle orbits the nucleus of an atom? A) Proton B) Neutron C) Electron D) Nucleus
C) Electron.
What determines the atomic number of an element?
The number of protons in the nucleus.
True or False: Electrons have a mass that is significantly larger than protons.
False.
Fill in the blank: The number of neutrons plus the number of protons in an atom is called its _____.
mass number.
What is an isotope?
Atoms of the same element with different numbers of neutrons.
Multiple Choice: Which of the following is NOT an element? A) Oxygen B) Water C) Gold D) Helium
B) Water.
What do we call a substance made of only one type of atom?
An element.
True or False: The periodic table organizes elements by atomic number.
True.
What is a molecule?
A group of two or more atoms bonded together.
Fill in the blank: Elements in the same column of the periodic table have similar _____.
properties.
What is the term for elements that have similar properties and are found in the same group on the periodic table?
Families or groups.
Multiple Choice: Which of the following is a noble gas? A) Nitrogen B) Neon C) Oxygen D) Carbon
B) Neon.
What is the primary difference between metals and nonmetals?
Metals are typically good conductors of heat and electricity, while nonmetals are not.
True or False: The elements in the periodic table are arranged by increasing atomic mass.
False.
Fill in the blank: The first 20 elements of the periodic table are known as the _____.
light elements.
What is a chemical symbol?
A one or two-letter notation representing an element.
What is the significance of the atomic mass of an element?
It indicates the average mass of an atom of that element, taking into account the isotopes.
Multiple Choice: Which element has the chemical symbol ‘H’? A) Helium B) Hydrogen C) Hafnium D) Holmium
B) Hydrogen.
