Atomic Structure
How many electrons fit in each shell around an atom?
The first shell (closest to the nucleus) can hold two electrons. The second shell can hold 8 electrons. The third shell can hold 32 electrons.
(A) vocabulary in science
Atom
What is a mixture?
a mixture is a compound made up of two or more chemical components that are not chemically linked.
AlF3
Aluminium Fluoride
Which is the main gas that makes up the Earth's atmosphere?
The air in Earth's atmosphere is made up of approximately 78 percent nitrogen and 21 percent oxygen.
How do I find the number of protons, electrons and neutrons that are in an atom of an element?
The number of electrons in a neutral atom is equal to the number of protons.
(B) vocabulary in science
What are examples of chemical mixtures?
blood, milk, salt and water, sand and water
CO2
Carbon Dioxide
What is the hardest natural substance on Earth?
Diamond is the hardest substance found on earth
Do atoms ever actually touch each other?
there's nothing to “touch,”
(C) vocabulary in science
Carbon
what is a heterogeneous mixture
A heterogeneous mixture is a mixture in which the composition is not uniform throughout the mixture.
MgCl2
Magnesium Chloride
What does DNA stand for?
Deoxyribonucleic acid
Are two atoms of the same element identical?
No. Two atoms of the same chemical element are typically not identical.
(I) vocabulary in science
Iridium
what is a homogeneous mixture
A homogeneous mixture is a gaseous, liquid or solid mixture that has the same proportions of its components throughout a given sample
H2S
Hydrogen Sulphide
How many bones are in the human body?
The adult human skeleton is made up of 206 bones.
How do I read an electron configuration table?
The tiny superscripts say how many electrons live in each orbital, the letters represent the orbitals that are available, and the big numbers say which energy level the orbitals are found in.
(X) vocabulary in science
Xenon
What are five mixtures
C4H10
Butane
The concept of gravity was discovered by which famous physicist?
Isaac Newton changed the way we understand the Universe