CHAPTER 03 Exercises
The table below gives you the composition of three particles:
Questions Core curriculum 1 Particle Electrons Protons Neutrons A 12 12 12 B 12 12 14 C 10 12 12 D 10 8 8 E 9 9 10 The table above describes some particles. a Which three particles are neutral atoms? b Which particle is a negative ion? What is the charge on this ion? c Which particle is a positive ion? What is the charge on this ion? d Which two particles are isotopes? e Use the table on page 33 to identify A to E. 2 The following statements are about the particles that make up the atom. For each statement write: p if it describes the proton e if it describes the electron n if it describes the neutron A the positively-charged particle B found with the proton, in the nucleus C the particle that can occur in different numbers, in atoms of the same element D held in shells around the nucleus E the negatively-charged particle F the particle with negligible mass G the number of these particles is found by subtracting the proton number from the nucleon number H the particle with no charge I the particle with the same mass as a neutron J the particle that dictates the position of the element in the Periodic Table 3 The atoms of an element can be represented by a set of three letters, as shown on the right. a What does this letter stand for? i X ii y iii z b How many neutrons are there in these atoms? i 107 47Ag ii 63 29Cu iii 1 1 H iv 20 10Ne v 238 92U c Bromine atoms have 36 neutrons. Describe a bromine atom, using the method in b.