Atoms and Isotopes Flashcards
Name the three sub atomic particles
Protons, electrons and neutrons
What is the mass of a proton?
1
What is the mass of an electron?
Almost zero / very small
What is the mass of a neutron?
1
What is the mass number of an atom?
The total number of protons and neutrons in the atom
What is the atomic number of an atom?
The number of protons (or electrons) in an atom
What is the charge on a proton?
+1 / positive / +
What is the charge on a neutron?
0 / zero / no charge
What is the charge on an electron?
-1 / negative / -
What is in the nucleus of an atom?
Protons and neutrons
Where are the electrons found in an atom?
In the shells
Sodium has a mass number of 23 and an atomic number of 11. How many protons, neutrons and electrons does it have?
11 protons
11 electrons
12 neutrons
Carbon has an atomic number of 6. How many electrons does it have and how are they arranged?
6 electrons
2 in the first shell, 4 in the second shell (2.4)
What name is given to atoms of the same element that have different numbers of neutrons?
Isotopes
Why do the isotopes carbon-12 and carbon-14 have different mass numbers?
Carbon-12 has 6 neutrons and carbon-14 has 8 neutrons (they both have 6 protons and 6 electrons)
Why does chlorine have a mass number that is not a whole number, 35.5?
The mass number is an average of the isotope mass numbers, taking into account their abundances (amounts).
An atom with 3 protons has a mass number of 7. How many neutrons does it have?
4
An atom has 7 protons, 7 neutrons and 7 electrons. How many of these sub-atomic particles are found in the nucleus?
14 (7 protons and 7 neutrons)
An atom has 17 protons, 17 electron and 18 neutrons. In the isotope of this element, what will be different?
The number of neutrons
A particle has 14 protons, 14 electrons and 15 neutrons. Is the particle an atom? Why?
Yes it is an atom.
It has the same number of positively charged protons and negatively charged electrons.
An atom has 6 electrons. What is the symbol of this element?
C
