Elements are placed on the periodic table according to their atomic number. The atomic number is based on
a. the number of electrons.
b. the number of neutrons.
c. the number of protons.
d. the number of nanoparticles.
Elements that have things in common can be grouped together on the periodic table.
Which two elements make up water?
a. nitrogen and hydrogen
b. oxygen and chlorine
c. oxygen and hydrogen
d. titanium and phosphorus
The number of electrons equal the number of protons in a neutral atom.
An element is made of
a. many types of atoms.
b. one type of atom.
Name the three elements that make up the NanoKids molecules.
____________, ____________, ____________
In molecules, the two most common types of bonds are
a. ionic and romantic.
b. ionic and covalent.
c. covalent and non-covalent.
An atom is
a. the smallest part of an element that can be recognized as that element.
b. the largest part of an element that can be recognized as that element.
c. defined by the number of protons.
d. (a) and (c).
Which of the following does NOT fall at the nanometer scale?
c. Carbon nanotubes
a. anything that takes up space.
b. only solid materials.