Matter and Change
The smallest unit of matter that maintains a chemical identity.
What is an atom?
The number of significant digits in 240.00 mg.
What is 5?
This is defined as the number of protons in the nucleus.
What is atomic number?
A three-dimensional region where electrons are likely to be found.
What is an orbital?
The name of group 2 elements.
What is the alkaline Earth metals?
A physical blend of matter, as long as each maintains its own properties.
What is a mixture?
The closeness of a measurement to the true or accepted value.
What is accuracy?
Atoms of the same element that have different masses.
What are isotopes?
When writing "n=3" this is the meaning of "n"
What is energy level?
The number of valence electrons in an atom of phosphorus.
What is 5?
table salt, baking soda, ammonia, and acetone are all examples.
What are compounds? (or pure substances)
The sum of 1.6670 g + 0.34 g.
What is 2.01 g?
This occupies most of the volume of an atom.
What are the electrons (or empty space)?
This states that two electrons in the same orbital must have opposite spins.
What is the Pauli Exclusion Principle?
Element in the same one of these can be expected to share similar properties.
What is a group?
This idea supports the assertion that the mass of the reactants is equal to the mass of the products in a chemical reaction.
What is the law of conservation of mass?
The density of gold is 19.3 g/cm3. Measurements made calculated the density as 14.5 g/cm3, 14.7 g/cm3, and 14.6 g/cm3. The results could be described this way.
What is precise, but not accurate?
What is 68?
This indicates the filling order of atomic orbitals.
What is the Aufbau Principle?
The most reactive nonmetals.
What are the halogens?
It can also be known as a solution.
What is a homogeneous mixture?
4356800 m rounded off to 3 sig figs.
What is 4360000 m or 4.36 x 106m?
The nuclear symbol to represent an atom of strontium with 49 neutrons.
What is...(look at my board I'm not paying for the full version of this website)
When an atom transitions from the ground state to an excited state this occurs.
What is energy is absorbed?
These elements have properties such as luster, conductivity, and malleability.
What are metals?