August 2019 Chemistry Regents Questions 1-10

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Strontium and barium have similar chemical properties because atoms of these elements have the same number of

In all atoms of bismuth, the number of electrons must equal the

Which term represents the fixed proportion of elements in a compound?

Which symbol represents a particle that has a mass approximately equal to the mass of a neutron?

An orbital is a region in an atom where there is a high probability of finding

Which two terms represent types of chemical formulas?

Which statement describes the earliest model of the atom?

As the elements in Period 2 are considered in order from lithium to fluorine, there is an increase in the