20 Questions
What defines an element?
The number of protons in an atom
What is the charge of a proton?
Positively charged
What is the function of electrons in an atom?
To participate in chemical reactions
What is the arrangement of electrons in an atom?
In a electron cloud with specific subshells
What is the relationship between energy levels and distance from the nucleus?
The farther from the nucleus, the higher the energy level
What is the number of possible energy levels around the nucleus?
7
What is the state of an electron that has returned to its lowest energy level?
Ground state
What determines the number of valence electrons in an atom?
Group number
What is the term for the number of protons in the nucleus of an atom?
Atomic number
What is the difference between isotopes of the same element?
Different number of neutrons
What is the average mass of all the isotopes of a particular element?
Atomic mass
Why do atoms strive to have a full valence shell of 8 electrons?
To become a Noble Gas
What is the atomic mass of an element based on?
The weighted average of the naturally occurring isotopes of the element
What is the basis of the modern periodic table?
The number of protons in the nucleus
What is the main difference between a molecule and a compound?
The number of different elements in the molecule
What is the main organizational feature of the periodic table?
Horizontal rows called periods and vertical columns called groups
What is the definition of matter?
Anything that has mass and occupies space
What is the characteristic of a metalloid?
It exhibits some properties of metals and some properties of nonmetals
What is the Law of Triads?
A method of organizing elements based on their similarity in every third element
What is the characteristic of a compound?
It is a pure substance formed by the chemical combination of at least two different elements
Learn about atoms being the smallest unit of matter, elements composed of the same type of atoms, and protons as positively charged subatomic particles. Discover how elements are defined by the atomic number, which represents the number of protons in an atom's nucleus.
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