C1.1 Flashcards
What is the substance called that is made of only one atom
An element
About how many different atoms are there
100
What do atoms contain?
Neutrons protons and electrons
Elements are represented with symbols. Give an example of an element and its symbol
Sodium, Na
Oxygen, O
Potassium, K
Etc
What is the central nucleus of atoms made up of? Where are the electrons placed?
Protons, neutrons
electrons are placed around the nucleus
What is the charge of an electron?
-1
What is the charge of a neutron?
0
What is the charge of a proton?
+1
What is the relationship between the number of electrons and the number of protons in the nucleus?
They are equal
1) ‘Atoms have no overall electrical charge’
2) ‘atoms have a positive electrical charge’
Which statement is true?
Statement 1
What do all atoms of a particular element have in common?
They have the same number of protons
The number of protons in an atom of an element is its ______ number. The sum of the protons and neutrons in an atom is its _____number.
1) atomic
2) mass
What part of the nucleus occupies particular energy levels?
Electrons
What part of the nucleus in an atom occupy the lowest available energy levels?
Electrons
What name is given to the elements in group 0 of the periodic table?
Noble gases
