CHEM 120 EXAM #1 (QUIZZES) EXAM WITH CORRECT QUESTIONS AND ANSWERS 2025

CHEM 120 EXAM #1 (QUIZZES) EXAM
WITH CORRECT QUESTIONS AND
ANSWERS 2025


How may elements have been discovered?



A. Less than 50



B. Less than 100



C. More than 100



D. More than 200 - CORRECT-ANSWERSC. More than 100



How many rows of elements are there in the periodic table of elements?



A. 5



B. 8



C. 4



D. 7 - CORRECT-ANSWERSD. 7

,Any atom is consisted of..



A. Electrons and protons in the nucleus and neutrons in orbitals surrounding the nucleus



B. Electrons and neutrons in the nucleus, and protons in orbitals surrounding the nucleus



C. Electrons in the nucleus, and protons and neutrons in orbitals surrounding the nucleus



D. Protons and neutrons in the nucleus, and electrons in orbitals surrounding the nucleus -



CORRECT-ANSWERSD. Protons and neutrons in the nucleus, and electrons in orbitals



surrounding the nucleus



What is true about the number of protons and electrons in an atom?



A. they are equal



B. the number of electrons equals the sum of the number of protons and neutrons



C. They are not related



D. The sum of the numbers of electrons and protons equals to the number of neutrons -



CORRECT-ANSWERSA. they are equal

, Which group of elements does oxygen belong to?



A. Group IA



B. Group VIB



C. Group VIIA



D. Group IVA



E. None of the above - CORRECT-ANSWERSE. None of the above



Among all elements, which has the largest electronegativity?



A. C



B. O



C. He (helium)



D. F



E. Fr (Francium) - CORRECT-ANSWERSD. F