Atoms, Isotopes, Reproduction Flashcards
(36 cards)
What is an atom?
The smallest unit of matter.
What is an element?
A substance made of only one type of atom.
What is a compound?
A substance made of more than one type of atom chemically combined.
What are the three types of sub-atomic particles?
- Protons
- Electrons
- Neutrons
What charge do protons have?
Positive charge (+)
What charge do electrons have?
Negative charge (-)
What charge do neutrons have?
No charge at all (0)
How much does a proton weigh?
1 atomic mass unit
How much does an electron weigh?
1/5000 atomic mass unit (almost nothing)
How much does a neutron weigh?
1 atomic mass unit
What is the overall charge of an atom?
Neutral; they have no charge.
What does the atomic number represent?
The number of protons or electrons in an atom.
What does the mass number represent?
The number of protons + neutrons in an atom.
What is the electron arrangement in an atom?
2-8-8-2
What are isotopes?
Atoms of the same element with different numbers of neutrons.
What is the most common isotope of carbon?
Carbon-12
Who organized the periodic table?
Dimitri Mendeleev
What is sexual reproduction?
Involves a male and a female parent producing sex cells called gametes.
What is fertilization?
The fusion of sperm and egg after sexual intercourse.
What is the male gamete called?
Sperm
What is the female gamete called?
Egg
What does the uterus do?
Where a fertilized cell will implant and a baby will develop.
What is the menstrual cycle?
The reproductive cycle of a female usually takes place over 28 days.
Fill in the blank: The process of a sperm being released is called _______.
ejaculation
