Atomic Structure
From the lesson
17 marksWhich pair are isotopes?
Source: Learners' Alley, Atomic Structure slides
How many neutrons are in 6530Zn2+?
Source: Learners' Alley, Atomic Structure slides
Which beam is deflected most in the same electric field?
Source: Learners' Alley, Atomic Structure slides
What is the electronic configuration of Cu2+?
Learners' Alley, Atomic Structure slides
Which element has a first ionisation energy lower than that of the element before it in the period?
Learners' Alley, Atomic Structure slides
| species | protons | neutrons | electrons |
|---|---|---|---|
| 23Na | 11 | 12 | 11 |
| 23Na+ | |||
| 32S2− | |||
| 65Zn2+ |
Learners' Alley, Atomic Structure slides
Learners' Alley, Atomic Structure slides
Learners' Alley, Atomic Structure slides
Write the full electronic configurations of these atoms.
Learners' Alley, Atomic Structure slides
Learners' Alley, Atomic Structure slides
Learners' Alley, Atomic Structure slides
Practice
17 marksWhich statement about electrons, neutrons and protons is correct?
2025 TKGS O Prelim P1 Q6
A particle, with a +4 charge, contains 48 particles in its nucleus and 18 electrons. What are the numbers of neutrons and protons found in its nucleus? Each option gives the neutrons, then the protons.
Source: 2024 Jurongville O Prelim P1 Q9
The nucleus of M3+ contains a total of 27 particles. 13 of the particles have a charge. Which statement about the ion is correct?
Source: 2024 USS O Prelim P1 Q5
The atomic number of cerium, Ce, is 58. A Ce4+ ion has 140 nucleons. How many neutrons and electrons are there in one Ce4+ ion? Each option gives the neutrons, then the electrons.
2025 FHSS O Prelim P1 Q6
Magnesium exists in three stable isotopes, Mg-24, Mg-25 and Mg-26. Which statements are correct about the properties of the isotopes?
1 The isotopes have the same number of electrons in their outermost shells.
2 The isotopes have the same physical properties.
3 The isotopes react with hydrochloric acid in the same manner.
Source: 2024 Whitley O Prelim P1 Q6
Which statement about isotopes is correct?
Source: 2025 TKGS O Prelim P1 Q7
Chlorine-35 and chlorine-37 are two isotopes of chlorine. Which statements are correct?
1 They have the same atomic number.
2 They have the same mass number.
3 They have the same physical properties.
4 They have the same chemical properties.
2025 JYSS O Prelim P1 Q7
The numbers of electrons, protons and neutrons in four different particles are shown.
| particle | electrons | protons | neutrons |
|---|---|---|---|
| W | 19 | 19 | 20 |
| X | 18 | 19 | 20 |
| Y | 20 | 20 | 20 |
| Z | 19 | 19 | 22 |
Which particles are isotopes of the same element?
2024 Compassvale O Prelim P1 Q7
An element, Z, has p protons and n neutrons in its nucleus. Which row gives a possible correct number of protons, neutrons and electrons in a negative ion of an isotope of Z? Each option gives the protons, neutrons and electrons in that order.
2025 MSHS O Prelim P1 Q3
An atom of one isotope of chlorine is represented by the symbol 37Cl. Particle R has one more neutron, two more protons and one more electron than this isotope of chlorine. Which symbol represents R?
Source: 2025 CHIJ O Prelim P1 Q4
A beam of protons was passed through an electrostatic field between two charged plates. The electrostatic field deflected the beam of protons towards the negatively charged plate. The lower the relative mass of the particle, the larger the deflection. The experiment was repeated using a beam of electrons in place of the beam of protons. Which row correctly shows the extent and the direction of the deflection of the beam of electrons?
Source: 2024 BTYSS FYE O EOY P1 Q6
An element J has a nucleon number of 45. The ion, J3+, contains 18 electrons. How many neutrons are there in an atom of J?
Source: 2024 Dunman O Prelim P1 Q6
In which species are the numbers of protons, neutrons and electrons all different?
Source: 2024 CHS O Prelim P1 Q7
An ion X2− has m nucleons and n electrons. What does the nucleus of an atom of X contain? Each option gives the number of protons, then the number of neutrons.
Source: 2024 SNGS O Prelim P1 Q1
Carbon has three naturally occurring isotopes, carbon-12, carbon-13 and carbon-14. Which statement about carbon-14 is incorrect?
Source: 2024 CCHM O Prelim P1 Q9
Which species are from the same group of the Periodic Table?
1 an atom with the electronic configuration of 2.3
2 an atom with the electronic configuration of 2.8.3
3 an ion with a 3− charge and an electronic configuration of 2.8.8
Source: 2025 TKGS O Prelim P1 Q24
The element with proton number 12 has similar chemical properties to the element with which proton number?
2024 BMSS O Prelim P1 Q26
