chemistry Flashcards
(16 cards)
What is the charge of a proton?
+1
Where are neutrons found?
In the nucleus
What is the atomic number?
The number of protons in an atom
What is the mass number?
The total number of protons and neutrons
What is an isotope?
Atoms of the same element with different numbers of neutrons
What is the charge and relative mass of an electron?
Charge: -1, Mass: almost 0
What is the atomic number of an atom with 6 protons and 6 electrons?
6
An atom has 17 protons and 18 neutrons. What is its mass number?
35
Which subatomic particles are found in the nucleus?
Protons and Nucleus
What is the charge of an atom with 11 protons and 11 electrons?
0 (neutral)
wo atoms have the same number of protons but different numbers of neutrons. What are they called?
Isotopes
Sodium has an atomic number of 11 and a mass number of 23. How many neutrons does it have?
12
Where are electrons found in an atom?
In energy levels (shells) around the nucleus
What is the overall charge of an atom and why?
Neutral — because the number of protons equals the number of electrons
What is the nucleus of an atom made of?
Protons and neutrons
What does the mass number represent?
The total number of protons and neutrons in the nucleus
