16/12/2019 Atoms, Compounds and Mixtures (STUDY BY TOPICS JUNIOR CLASS) 0Comments by Gate Academy Welcome to your Atoms, Compounds and Mixtures (STUDY BY TOPICS JUNIOR CLASS) NAME EMAIL PHONE NUMBER 1. Water is a compound made up of two different elements. These elements areSodium and chlorineHydrogen and nitrogenHydrogen and oxygenOxygen and iro2. How many protons are there in an atom of sodium which has an atomic number of 11 and a mass number of 23?233411123. Where two or more substances are mixed together but not chemically combined, this substance is calleda moleculea mixturea compoundan atom4. The chemical symbol for oxygen isNOYX5. The smallest part of a compound which still has the properties of that compound is calleda solidan atoma mixturea molecule6. When a substance is analysed using an electron microscope, it is found to contain only one type of atom.This substance isa compoundneither of the other threea mixturean element7. Who founded the atomic theory Blaise PascalMicheal FaradayJohn DaltonRoger Williams8. Which component of atom is negatively chargedelectronprotonisotronneutron9. Which of the following sets of substances represents mixtures only?Gold, carbon and airOrange juice, sodium and hydrogenAir, blood and sodium chlorideBrass, seawater and air10. An atom of nitrogen has 7 protons and 7 neutrons in its nucleus. What is its electronic structure?2,72,52,8,45,211. Which one of the following substances is a compound?Sodium fluorideOxygenHydrogenIron12. The period in which an element is located gives usthe number of electrons in its outer shell.the electronic configuration of that element.the number of electron shells that the electron has.the number of neutrons in that element.13. "Sub-atomic particle" is the name given tothe tiny particles found inside an atom.particles found in a nuclear submarine.the tiny particles found inside the nucleus.the tiny particles found outside the nucleus.14. One of the following substances is not an element. Which one is it?MercuryWaterNitrogenHydrogen15. The properties of a compound will be the same as the properties of the elements that make up the compoundTrueFalse16. Nitrogen is in group V (5) of the periodic table. How many electrons are there in its outer shell?71452117. The chemical symbol "Ca" represents which of the following elements?CalciumSulfurCopperCarbon18. How many neutrons does the element of atomic number 1 and mass number 1 have?20None of other mentioned values119. The chemical symbol of silver isAuAlAgAd20. Study the four diagrams representing different substances. Which two of these diagrams represents elements?A and DB and CA and BC and D21 out of 20Time is Up!