The Periodic Table
This group of elements has 2 valence electrons.
Alkaline earth metals
What are groups?
Vertical columns on the Periodic Table
Outermost electrons that determine how an atom reacts.
Valence electrons
Which subatomic particle has no electrical charge?
Neutrons
Which phase of matter has a definite shape and definite volume?
A solid
These kinds of elements have both metal and nonmetal properties
Metalloids
Which element is described as the most electronegative?
Fluorine
Distance between two consecutive peaks in a wave.
Wavelengths
What is the atomic number of an element?
The number of protons in the nucleus
In a saltwater solution, what is the solvent?
Water
As you move down a group on the periodic table, atomic radius...
Increases
What are periods?
Horizontal rows on the Periodic Table
What is the equation that correctly relates wavelength (λ), frequency (f), and the speed of light (c)?
E=hf
Isotopes of the same element have different numbers of...
Neutrons
An astronaut has a mass of 80 kg on Earth. What is their mass on the Moon?
80kg
Why are Noble Gases considered the most non-reactive group of elements?
Having 8 valence electrons means less reactivity
Atomic mass is usually shown as a decimal on the periodic table because...
It is the average mass of all isotopes of the element
Which sublevel has 3 orbitals and can hold up to 6 electrons?
p
Which law states that a compound always has the same ratio of types of atoms?
Law of Definite Proportions
What density does a substance need to have in order to float on water? (in g/mL)
>1 g/mL
Electronegativity is the tendency of an atom to...
Attract electrons in a chemical bond
Why does the atomic radius generally increase down a group?
Atoms in lower periods have more energy levels (electron shells).
In Lewis dot notation, how many valence electrons does oxygen (O) have?
Oxygen has a total of 16 electrons.
6 valence electrons
Which scientist is credited with the "plum pudding" model of the atom?
J.J. Thomson
According to the law of conservation of mass, when a candle burns...
Atoms rearrange to form new substances