Which of the following statements best describes isotopes?

Isotopes are variations of an element that have the same number of protons but a different number of neutrons.

Isotopes are variations of an element that have a different number of protons and electrons.

Isotopes are variations of an element that have a different number of protons and neutrons.

Isotopes are variations of an element that have a different number of neutrons and electrons.

What is the difference between an element and an isotope?

An element represents a specific type of atom, while an isotope refers to different versions of the same element with varying numbers of neutrons.

An element refers to different types of atoms, while an isotope represents different types of elements.

An element refers to different versions of the same atom with varying numbers of protons, while an isotope represents a specific type of atom.

An element represents a specific type of atom, while an isotope refers to different versions of the same element with varying numbers of electrons.

What is the difference between an atomic number and an atomic mass?

The atomic number represents the number of protons in an atom, while the atomic mass represents the sum of protons and neutrons.

The atomic number represents the number of electrons in an atom, while the atomic mass represents the sum of protons and electrons.

The atomic number represents the number of neutrons in an atom, while the atomic mass represents the sum of protons and electrons.

The atomic number represents the sum of protons and neutrons in an atom, while the atomic mass represents the number of protons.

Week 2 Tuesday Assessment

D.SAT CORE/INT/ADV WEEK 2 TUESDAY

WEEK 1 - TEST 1 of 2 TUESDAY 3/17

I beg to move, That this House welcomes the formation of a Government representing the united and inflexible resolve of the nation to prosecute the war with Germany to a victorious conclusion. On Friday evening last I received His Majesty's commission to form a new Administration. It as the evident wish and will of Parliament and the nation that this should be conceived on the broadest possible basis and that it should include all parties, both those who supported the late Government and also the parties of the Opposition. I have completed the most important part of this task. A War Cabinet has been formed of five Members, representing, with the Opposition Liberals, the unity of the nation. The three party Leaders have agreed to serve, either in the War Cabinet or in high executive office. The three Fighting Services have been filled. It was necessary that this should be done in one single day, on account of the extreme urgency and rigour of events. A number of other positions, key positions, were filled yesterday, and I am submitting a further list to His Majesty to-night. I hope to complete the appointment of the principal Ministers during to-morrow. the appointment of the other Ministers usually takes a little longer, but I trust that, when Parliament meets again, this part of my task will be completed, and that the administration will be complete in all respects. I considered it in the public interest to suggest that the House should be summoned to meet today. Mr. Speaker agreed, and took the necessary steps, in accordance with the powers conferred upon him by the Resolution of the House. At the end of the proceedings today, the Adjournment of the House will be proposed until Tuesday, 21st May, with, of course, provision for earlier meeting, if need be. The business to be considered during that week will be notified to Members at the earliest opportunity. I now invite the House, by the Motion which stands in my name, to record its approval of the steps taken and to declare its confidence in the new Government. To form an Administration of this scale and complexity is a serious undertaking in itself, but it must be remembered that we are in the preliminary stage of one of the greatest battles in history, that we are in action at many other points in Norway and in Holland, that we have to be prepared in the Mediterranean, that the air battle is continuous and that many preparations, such as have been indicated by my hon. Friend below the Gangway, have to be made here at home. In this crisis I hope I may be pardoned if I do not address the House at any length today. I hope that any of my friends and colleagues, or former colleagues, who are affected by the political reconstruction, will make allowance, all allowance, for any lack of ceremony with which it has been necessary to act. I would say to the House, as I said to those who have joined this government: "I have nothing to offer but blood, toil, tears and sweat." 2 We have before us an ordeal of the most grievous kind. We have before us many, many long months of struggle and of suffering. You ask, what is our policy? I can say: It is to wage war, by sea, land and air, with all our might and with all the strength that God can give us; to wage war against a monstrous tyranny, never surpassed in the dark, lamentable catalogue of human crime. That is our policy. You ask, what is our aim? I can answer in one word: It is victory, victory at all costs, victory in spite of all terror, victory, however long and hard the road may be; for without victory, there is no survival. Let that be realised; no survival for the British Empire, no survival for all that the British Empire has stood for, no survival for the urge and impulse of the ages, that mankind will move forward towards its goal. But I take up my task with buoyancy and hope. I feel sure that our cause will not be suffered to fail among men. At this time I feel entitled to claim the aid of all, and I say, "come then, let us go forward together with our united strength."

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