In every slide, you will find a question with 2 – 5 choices.
m m m m m m m m m m m m
The answers of the questions will be in the last slide, so don’t forget to write your answers (To check them 💪
m m m m m m m m m m m m m m m m m m m m m
*** You can use the periodic table anytime 😊.
m m m m m m m m
,1. How many electrons, protons, & neutrons in an Atom X (Atomic no. is 19,
m m m m m m m m m m m m m
mass no. is 39)? m m m
A. (20, 20, 19).
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B. (20, 19, 20).
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C. (19, 19, 20).
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D. Can’t be determined.
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,2. How many electrons will there be in the outer energy shell of an atom of X
m m m m m m m m m m m m m m m
(Atomic no. is 19, mass no. is 39)?
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A. 1.
B. 9.
C. 19.
D. None of the above.
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, 3. What is the electronic configuration of X (Atomic no. is 19, mass no. is 39)?
m m m m m m m m m m m m m m
A. 2 – 8 – 8 – 1.
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B. 2 – 8 – 9.
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C. 1SS2 2PS2 3PS1 .
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D. A+C
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