CHAPTER 2 PART 1 Flashcards
COVER EVERYTHING I MENTION (21 cards)
What is the atomic number of an element?
The atomic number is the number of protons in the nucleus of an atom.
True or False: The mass number is the sum of protons and electrons in an atom.
False. The mass number is the sum of protons and neutrons.
Fill in the blank: Isotopes of an element have the same number of protons but different numbers of ______.
neutrons.
What does the periodic table organize?
The periodic table organizes elements based on their atomic number and properties.
What is a molecule?
A molecule is a group of two or more atoms bonded together.
Which of the following is a positive ion? A) Anion B) Cation
B) Cation
What is a chemical formula?
A chemical formula is a representation of a substance using symbols for its constituent elements.
True or False: The atomic mass of an element is the weighted average of all its isotopes.
True.
What element has an atomic number of 6?
Carbon.
Fill in the blank: The elements in a group of the periodic table have similar ______.
chemical properties.
What is the difference between a molecule and a compound?
A molecule can consist of the same or different atoms, while a compound consists of two or more different elements.
Which particle has no charge? A) Proton B) Neutron C) Electron
B) Neutron
What is the mass number of an element with 12 protons and 13 neutrons?
25.
True or False: All isotopes of an element behave the same chemically.
True.
What is an anion?
An anion is a negatively charged ion.
Which of the following is a chemical formula for water? A) H2O B) O2H C) H2O2
A) H2O
What is the significance of the periodic law?
The periodic law states that the properties of elements are a periodic function of their atomic numbers.
Fill in the blank: The number of electrons in a neutral atom is equal to its ______.
atomic number.
What is the charge of a cation?
A cation has a positive charge.
True or False: The chemical symbol for sodium is Na.
True.
