Which type of matter is always made up of only one kind of atom? A. Element
B. Mixture
C. Molecule
D. Compound
pls answer fast

The number to the right of an element's symbol (ex. c-12) identifies the of an isotope.

Astring vibrates with a frequency of 10 hz. why can't a person hear the sound waves produced by the vibrating string, no matter how large the amplitude of the waves? out! this is homework and due tomorrow! you so much!

Covalent bonds generally form when the bonded elements have a difference in electronegativity less than 1.5. subtract the electronegativities for the following pairs of elements and predict whether they form a covalent bond. electronegativity difference of c and c: ionic covalent electronegativity difference of mg and cl: ionic covalent