The periodic table
These are the horizontal rows in the periodic table.
What are: PERIODS
These are the three subatomic particles that make up an atom.
What are protons, neutrons, and electrons?
These elements are found in Group 1 of the periodic table and are highly reactive, especially with water.
What are the alkali metals?
In a Bohr model, this is the number of electrons that occupy the first energy level (shell).
What is 2
This is the number of protons in the nucleus of an atom, and it determines the element's identity.
What is the atomic number?
These vertical columns show the elements on the periodic table.
What are groups or families
This is the number of protons in an atom and determines the element's identity.
What is the atomic number
This group of elements in Group 18 of the periodic table is characterized by their full outer electron shell and lack of reactivity
What are the noble gases?
This scientist developed the Bohr model of the atom, which showed electrons in specific energy levels around the nucleus.
Who is Neils Bohr
This is the sum of the number of protons and neutrons in an atom's nucleus.
What is the mass number?
Period 2 contains how many elements of the periodic table.
What is 8 elements
These are atoms of the same element that have the same number of protons but a different number of neutrons.
What are isotopes
This group of elements, found in Group 17, is highly reactive and often forms salts when combined with metals.
What are the halogens?
This symbol represents the number of valence electrons in an atom and is used in a Lewis dot diagram.
What are dots (or valence electrons)?
This term refers to the weighted average mass of all the naturally occurring isotopes of an element, taking into account their relative abundance.
What is atomic mass (or atomic weight)?
The periodic table arranges elements according to this.
What are Increasing atomic numbers
his describes how electrons are arranged in energy levels around the nucleus of an atom, and it follows a pattern based on the periodic table.
What is electron configuration
These elements are found in Groups 3-12 of the periodic table and are known for their ability to form colorful compounds and their use as catalysts in chemical reactions.
What are transition metals
In a Bohr model, the maximum number of electrons that the second energy level (shell) can hold is this number.
What is 8?
Isotopes of an element have the same number of protons but different numbers of these subatomic particles, which gives them different mass numbers.
What are neutrons?
This element can be found in Group 1, Period 3
What is Sodium (Na)
This scientist is credited with developing the modern atomic theory, which states that all matter is made of atoms, atoms of the same element are identical, and atoms combine in simple ratios to form compounds.
Who is John Dalton
These two rows of elements, located below the main body of the periodic table, include metals that are often called "inner transition metals." The actinides include some radioactive elements.
What are the lanthanides and actinides?
In a Lewis dot diagram for the molecule H₂O, this element is the central atom with two single bonds to hydrogen atoms.
What is oxygen
The atomic mass of an element is calculated by multiplying the mass of each isotope by its relative abundance, then adding the results. For example, if an element has two isotopes, one with a mass of 10 amu and 75% abundance, and the other with a mass of 11 amu and 25% abundance, the atomic mass is:
(10 * 0.75) + (11 * 0.25). What is the atomic mass of this element?
What is 10.25 amu?