The radiation given off by a radioactive source can be measured with a. The weak radiation should be recorded in units ofbecause the lab sources are extremely low on thescale. Radiation is a random event so it is best to make each measurement.

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explanation:

covalent bonds

consist of pairs of electrons shared by two atoms, and bind the atoms to fixed orientation and requre high energies to break them

ionic bonds

when two atoms differ considerably in their electronegativity, then one of the atoms will lose its electron to the other atom. this results in a positively charged ion(cation) and a negatively charged ion (anion)