P.7.5C.1
This positively charged particle is found in the nucleus.
What is a proton?
This early idea said matter is made of tiny particles called atoms.
What is atomic theory?
This pure substance contains only one type of atom.
What is an element?
These elements are usually shiny, malleable, and good conductors of heat and electricity.
What are metals?
The small ₂ in H₂O tells you this many hydrogen atoms are in one water molecule.
What is two?
This number tells how many protons an atom has and identifies the element.
What is the atomic number?
The cathode ray experiment provided evidence that atoms contain these negatively charged particles.
What are electrons?
Water, H₂O, is this type of substance because hydrogen and oxygen are chemically bonded.
What is a compound?
These elements have properties of both metals and nonmetals and are often semiconductors.
What are metalloids?
This type of bond forms when a metal transfers electrons to a nonmetal.
What is an ionic bond?
An atom has 11 protons and a mass number of 23. It has this many neutrons.
What is 12?
In the gold foil experiment, most particles passed straight through the foil. This showed that an atom is mostly this.
What is empty space?
Salt dissolves evenly in water. The result is this type of mixture.
What is a solution?
Elements in the same vertical column tend to have similar properties. This column is called a ____.
What is a group or family?
This type of bond forms when nonmetal atoms share electrons.
What is a covalent bond?
An atom has 15 protons and 16 neutrons. This is its mass number.
What is 31?
Some particles bounced back during the gold foil experiment. This showed that the atom has this small, dense, positively charged center.
A student needs to separate sand from salt water, then recover the salt. These are the two methods they should use in order.
What are filtration, then evaporation?
Sodium is in Group 1, while neon is in Group 18. This element is more likely to react because it can easily lose one electron.
What is sodium?
In K₂SO₄, there are this many potassium, sulfur, and oxygen atoms, respectively.
What are 2 potassium, 1 sulfur, and 4 oxygen atoms?
If the atomic mass number of an atom is 35, which statement is most accurate?
A. The atom is not an isotope.
B. The atomic number is less than 17.
C. The atomic number is less than 17.
D. The number of protons does not equal the number of neutrons.
D. The number of protons does not equal the number of neutrons
The electrical charge of the nucleus of an atom is +12. How many electrons does the atom have in its neutral state?
A. 6
B. 12
C. 18
D. 24
B. 12
_________ can be broken down during chemical, but not physical, changes.
A. Elements
B. Mixtures
C. Solutions
D. Compounds
D. Compounds
Where are the metals, non-metals, and metalloids located on the periodic table?
Metals - left and center
Non-metals - right
Metalloids - stair steps
Rust is a compound with the formula Fe₂O₃ Which elements combine to form rust?
What is iron and oxygen?