Four statements about atoms are listed. 1 The centre of an atom is positively charged. 2 Protons and electrons are located in the nucleus. 3 Protons and electrons have the same mass. 4 Most of the mass of an atom is in the nucleus. Which statements are correct?
A.
1 and 2
B.
1 and 4
C.
2 and 3
D.
3 and 4
Exam No：0620_s24_qp_21 Year：2024 Question No：4
Answer:
B
Knowledge points:
2.2.1. Describe the structure of the atom as a central nucleus containing neutrons and protons surrounded by electrons in shells
2.2.2. State the relative charges and relative masses of a proton, a neutron and an electron
2.2.3. Define proton number / atomic number as the number of protons in the nucleus of an atom
2.2.4. Define mass number / nucleon number as the total number of protons and neutrons in the nucleus of an atom
2.2.5. Determine the electronic configuration of elements and their ions with proton number 1 to 20, e.g. 2,8,3
2.2.6.1. Group VIII noble gases have a full outer shell
2.2.6.2. the number of outer shell electrons is equal to the group number in Groups I to VII
2.2.6.3. the number of occupied electron shells is equal to the period number
Solution:
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