Atoms and the Periodic Table

1How have Dalton’s ideas about atoms changed?

• atoms are not indestructible but are made up of smaller particles

• atoms are round particles

• atoms are the smallest possible particles

What are the names of the three main subatomic particles?

• protons, neutrons, electrons

• protons, geutrons, electrons

• rotons, neutrons, electrons

• protons, neutrons, positrons

What is the nucleus of an atom made up of?

• protons and neutrons

• neutrons and electrons

• protons and electrons

• neutrons and positrons

How are electrons arranged in an atom?

• orbiting the nucleus in regions called shells

• in the nucleus

How do protons and electrons compare in terms of relative charge?

• protons have a positive (+1) charge and electrons have a negative (−1) charge

• electrons have a positive (+1) charge and protons have a negative (−1) charge

Why are most atoms neutral?

• they have an equal number of protons and electrons

• the have an equal number of protons and neutrons

• they have an equal number of neutrons and electrons

What is the fundamental difference between atoms of different elements?

• they contain a different number of protons

• they contain a different number of neutrons

• they contain a different number of electrons

How does the size of a nucleus compare to the size of the atom?

• the nucleus is tiny compared to the size of the atom

• the nucleus takes up most of the space in an atom

How many protons are there in an atom with an atomic number of 26?

• 26

• 52

• 13

How many neutrons are there in an atom with an atomic number of 26 and a mass number of 56?

• 30

• 26

• 13