2.3. Isotopes
A subsection of Chemistry, 0620, through 2. Atoms, elements and compounds
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This question is about uranium and its compounds. An isotope of uranium is represented by the symbol shown. 235U Deduce the number of electrons and neutrons in one atom of this isotope of uranium. number of electrons number of neutrons  State the main use of this isotope of uranium. Complete the sentence about isotopes using words from the list. atoms compound electrons element ions mixture molecules neutrons substance Isotopes are of the same which have the same proton number but a different number of .  Uranium is a metal. Give two physical properties which are characteristic of all metals.  Uranium reacts with hydrogen to form uranium hydride, UH3. The reaction is reversible. Complete the chemical equation for this reaction by: ● ● balancing the equation ● ● drawing the symbol for a reversible reaction in the box. 2U + H2 …. UH3  A compound of uranium has the formula UO2F2. Complete the table to calculate the relative formula mass of UO2F2. Use your Periodic Table to help you. number of atoms relative atomic mass uranium 1 × 238 = 238 oxygen fluorine  relative formula mass =  
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THEORY
2019
Paper 3, Variant 2
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