Atomic Structure
This subatomic particle has a negative charge.
What is an electron?
The first energy level in a Bohr model can hold this many electrons.
What is 2?
If sodium loses 1 electron, it forms this ion.
What is Na⁺ or +1?
H₂ + Cl₂ → 2HCl is this type of reaction.
What is synthesis?
This arrow (→) in a chemical equation means this.
What is yields?
These particles are found in the nucleus and have no charge.
What are neutrons?
A neutral oxygen atom has this many valence electrons.
What is 6?
Chlorine forms this ion when it gains 1 electron.
What is Cl⁻?
CH₄ + O₂ → CO₂ + H₂O is always this type of reaction.
What is combustion?
The substances on the left side of the arrow are called this.
What are reactants?
The number of protons in an atom equals this number on the periodic table.
What is the atomic number?
These models show electrons in fixed orbits around the nucleus.
What are Bohr models?
These never change when ions are formed.
What are protons?
2KClO₃ → 2KCl + 3O₂ is this type of reaction.
What is decomposition?
The small numbers inside a chemical formula, like the 2 in H₂O, are called this.
What are subscripts?
Atoms of the same element that have different numbers of neutrons are called ___.
What are isotopes?
Sodium’s Bohr model requires this many shells.
What is 3?
Calcium forms this ion by losing 2 electrons.
What is Ca²⁺?
This element must always be present in a combustion reaction.
What is oxygen?
The “2” in front of H₂ in 2H₂ + O₂ → 2H₂O is called this.
What is a coefficient?
An atom with 16 protons and 18 electrons has this charge.
What is –2?
This part of the atom determines its reactivity.
What is the valence shell?
The Bohr model of Cl⁻ shows this many electrons in the outer shell.
What is 8?
Fe₂O₃ + 3CO → 2Fe + 3CO₂ is this type of reaction.
What is single replacement?
This law explains why equations must be balanced.
What is the Law of Conservation of Mass?