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Questions

Explanations

1 Which phrase describes an Al atom?

(1) a negatively charged nucleus, surrounded by negatively charged electrons

(2) a negatively charged nucleus, surrounded by positively charged electrons

(3) a positively charged nucleus, surrounded by negatively charged electrons

electrons=negative

2 What is the number of electrons in an atom that has 20 protons and 17 neutrons?

(1) 37                    (3) 3

(2) 20                    (4) 17

3 The mass of a proton is approximately equal to the mass of

(1) an electron                   (3) an alpha particle

(2) a neutron                      (4) a beta particle

4 When a sample of CO₂(s) becomes CO₂(g), there is a change in

(1) bond type

(2) gram-formula mass

(3) molecular polarity

(4) particle arrangement

solids close together

5 Which properties are characteristic of Group 2 elements at STP?

(1) good electrical conductivity and electronegativities less than 1.7

(2) good electrical conductivity and electronegativities greater than 1.7

(3) poor electrical conductivity and electronegativities less than 1.7

(4) poor electrical conductivity and electronegativities greater than 1.7

electronegativities are very small