Elements and Substances

Question 3:Table 1 shows several elements with their proton numbers and nucleon numbers respectively.(a) Determine the number of neutrons for the atomic elements X, Y and Z.(b) Draw the electron arrangement for the atomic element X, Y and Z.(c) In your opinion, where are the elements X, Y and Z located in the Modern Periodic … Read more

Question 1:Photograph 1 shows two types of substances.(a) State the type of particles that form:(i) salt(ii) sugar(b) Give two other examples of substances that are formed from the same type of particles as salt and sugar.(c) Give two examples of substances that contain the oxygen that exists in the form of molecules and ions. Answer:(a)(i) … Read more

Question 1:State the definition of isotopes. Answer:Two or more atoms of an element which have atoms with the same number of protons but different number of neutrons. Question 2:Give three examples of isotopes. Answer:Sodium-24/ Phosphorus-32/ Cobalt-60/ Carbon-14/ Iodine-131(any three) Question 3:An atom has 10 protons, 10 neutrons and 10 electrons. What is the nucleon number … Read more

Question 1:State the position of the following elements in the Modern Periodic Table of Elements.(a) Lithium (b) Silver (c) Helium (d) Gold Answer:(a) Group 1, Period 2(b) Group 11, Period 5(c) Group 18, Period 1(d) Group 11, Period 6 Question 2:Give two examples of elements in Group 17. Answer:Fluorine/ chlorine/ bromine/ iodine/ astatine(any two) Question … Read more

Question 1:Give three types of particles that make up a substance. Answer:Atoms, molecules and ions Question 2:State an example of a substance that is made up of iron in the form of ions. Answer:Rust Question 3:Classify the following substances according to the type of particles that they are made up of either atoms, molecules or … Read more