Chemistry Flashcards
(36 cards)
What represents an atom?
An atom can be represented by showing how the electrons are arranged in energy levels around the nucleus.
What is true about the number of protons and electrons in a neutral atom?
In a neutral atom, the number of protons always equals the number of electrons.
What charge do electrons carry?
Electrons are negatively charged.
What surrounds the atomic nucleus?
A cloud of fast-moving electrons surrounds the atomic nucleus.
What are neutrons?
Neutrons are similar to protons in size and mass but do not carry any charge.
Where are neutrons found?
Neutrons are found in the atomic nucleus.
What are the three main sub-atomic particles?
The three main sub-atomic particles are protons, neutrons, and electrons.
What is the charge of protons?
Protons are positively charged.
Where are protons located?
Protons are found in the nucleus, deep in the center of the atom.
What determines the structure of the atom?
The structure of the atom is determined by protons, neutrons, and electrons.
What is the atomic number of an atom?
The atomic number of the atom is the number of protons.
Where are all known elements listed?
All the known elements are listed on the periodic table.
What is unique about the atoms of each element?
The atoms of each element are unique and identical to each other.
What is matter made up of?
All matter is made up of tiny particles called atoms.
What is the smallest unit of matter?
Atoms are the smallest unit of matter.
We can represent an atom by showing how the electrons are arranged in energy levels around the
positive nucleus. The number of electrons for an element is equal to the element’s atomic number.
For example:
1 energy level=max. 2 electrons
2n energy level = max.8 electrons
3re energy level = max. 8 electrons
th energy Level for us(2 electrons - only go
to alomic number 20Ccalcium ))
Lithium
