Topic 1 Structure of the atom and the Periodic Table๐ Flashcards
What is the basic unit of matter?
The atom.
True or False: An atom consists of protons, neutrons, and electrons.
True.
Fill in the blank: The center of an atom is called the ___.
nucleus.
What charge do protons carry?
Positive charge.
What is the charge of electrons?
Negative charge.
How do neutrons differ from protons?
Neutrons have no charge.
What is the mass number of an atom?
The sum of protons and neutrons in the nucleus.
Which subatomic particle determines the identity of an element?
Protons.
What is the periodic table?
A tabular arrangement of elements based on their atomic number.
True or False: The modern periodic table is arranged by increasing atomic mass.
False.
What does the atomic number of an element represent?
The number of protons in the nucleus.
Who created the first periodic table?
Dmitri Mendeleev.
Fill in the blank: Elements in the same ___ have similar chemical properties.
group.
What are periods in the periodic table?
Horizontal rows of elements.
What is the significance of the zigzag line on the periodic table?
It separates metals from nonmetals.