Atomic Structure & The Periodic Table

9.The X⁺ ion of element X has 16 electrons and a nucleon number of 37. What is the correct Group number for element X?

10.Which row correctly describes the number of outer shell electrons and properties of isotopes?

11.Iridium has two isotopes, Ir-191 and Ir-193. Calculate the relative atomic mass of iridium using the data: mass number 191 abundance 62.7%, mass number 193 abundance 37.3%.

12.A selenide ion has the notation ³⁴₇₉Se²⁻. Which row correctly describes the subatomic particles in a selenide ion?

13.A sample of neon consists of three isotopes: Ne-20 (90.9%), Ne-21 (0.3%), and Ne-22 (8.8%). What is the relative atomic mass of neon to one decimal place?

14.The diagram shows the atomic structure of an element. The nucleus contains 11 protons and 12 neutrons. The electron shells contain 2, 8, and 1 electrons respectively. Which element is it?

15.An atom of element X has an electronic configuration of 2,8,6. Which group of the Periodic Table does element X belong to?

16.Copper has two isotopes: Cu-63 and Cu-65. The relative abundance of Cu-63 is 69%. What is the relative atomic mass of copper?

17.The diagram shows the electronic structure of an atom. There are 2 electrons in the first shell, 8 in the second, and 2 in the third. What is the atomic number of this element?

18.Which statement about isotopes is correct?

19.The relative atomic mass of chlorine is 35.5. Which statement explains this value?

20.A sample of rubidium contains two isotopes: Rb-85 (72%) and Rb-87 (28%). Calculate the relative atomic mass of rubidium to one decimal place.

21.The particle diagram shows a mixture of two compounds. Which statement is correct?

22.An atom has the symbol ⁴⁰₁₈Ar. How many neutrons does it have?

23.The table shows the numbers of protons, neutrons, and electrons in four particles. Which two particles are isotopes of the same element? Particle P: protons 6, neutrons 6, electrons 6 Particle Q: protons 8, neutrons 7, electrons 8 Particle R: protons 7, neutrons 7, electrons 7 Particle S: protons 6, neutrons 8, electrons 6

24.The electronic configuration of a calcium ion (Ca²⁺) is:

25.A student measures the mass of a sample of sulfur powder before and after heating it in air. The mass increases. Which statement explains this observation?

26.The diagram shows the atomic structure of an atom of element X. The nucleus contains 11 protons and 12 neutrons. The electron shells contain 2, 8, and 1 electrons respectively. Which statement about element X is correct?

27.The table shows the numbers of protons, neutrons, and electrons in four particles. Which two particles are isotopes of the same element? Particle P: protons 6, neutrons 6, electrons 6 Particle Q: protons 7, neutrons 7, electrons 7 Particle R: protons 6, neutrons 8, electrons 6 Particle S: protons 8, neutrons 8, electrons 8

28.Which of the following statements about the relative charge and mass of subatomic particles is correct?

29.In a solid, particles are arranged in a regular pattern and vibrate about fixed positions. In a liquid, particles are close together but arranged randomly, able to move past each other. In a gas, particles are far apart, arranged randomly, and move quickly in random directions. Which state of matter is described by the first sentence?

30.In an experiment, a student heats a blue hydrated copper(II) sulfate crystals in a test tube. The crystals turn white and water droplets appear on the cooler parts of the test tube. Which type of change has occurred?

31.Which of the following is the correct definition of an element?

32.Which particle has a relative mass of 1 and a charge of 0?

33.What is the electronic configuration of a sulfur atom?

34.An atom of element X has 12 protons and 12 neutrons. What is its mass number?

35.Beryllium has atomic number 4 and mass number 9. Which set of numbers correctly describes its atomic structure?

36.An atom has the electronic configuration 2,8,7. Which group of the Periodic Table does it belong to?

37.Which of the following is a mixture?

38.A sample of lithium contains two isotopes: Li-6 (7.5%) and Li-7 (92.5%). What is the relative atomic mass of lithium to one decimal place?

39.The diagram shows the atomic structure of an atom. The nucleus contains 11 protons and 12 neutrons. The electron shells contain 2, 8, and 1 electrons respectively. Which element is this?

40.Which statement about an element is correct?

41.Compounds can be separated into their elements by physical means such as filtration or evaporation.

42.The electronic configuration of an atom is 2,8,7. Which group of the Periodic Table does it belong to?

43.Match each particle with its relative charge.

44.Arrange the following electron shells in order of increasing energy (lowest energy first).

45.Which of the following are true about isotopes? (Select all that apply)

46.The relative atomic mass of an element is always a whole number.

47.Match each subatomic particle with its relative charge.

48.The table shows the numbers of protons, neutrons, and electrons in four particles. Which two particles are isotopes of the same element? Particle P: protons 6, neutrons 6, electrons 6 Particle Q: protons 6, neutrons 8, electrons 6 Particle R: protons 7, neutrons 7, electrons 7 Particle S: protons 8, neutrons 8, electrons 8

49.Complete the sentence.

50.A sample of lithium contains two isotopes: Li-6 (7.5%) and Li-7 (92.5%). Calculate the relative atomic mass of lithium to one decimal place.

51.What is the name given to the total number of protons and neutrons in an atom?

52.Boron has two isotopes: B-10 with a mass of 10.013 amu and abundance 19.9%, and B-11 with a mass of 11.009 amu and abundance 80.1%. Calculate the relative atomic mass of boron to two decimal places.

53.State the meaning of the term 'isotopes'.

54.Boron has two isotopes: B-10 with a mass of 10.013 amu and abundance 19.9%, and B-11 with a mass of 11.009 amu and abundance 80.1%. Calculate the relative atomic mass of boron to two decimal places.