Refer to the following figure (first three rows of the periodic table) to answer
ID: 199874 • Letter: R
Question
Refer to the following figure (first three rows of the periodic table) to answer the questions below Hydrogen Atomic number He First shell Atomic mass Electron LithiumBeryllium Boron Carbon Nitrogen Oxygen Fluorine Neon shell SodiumMagnesium Aluminum Silicon Phosphorus S Sulfur Chlorine Argon 12Mg Third 15) What element does not prefer to react with other elements? A) hydrogen B) helium C) beryllium D) both hydrogen and beryllium 16) Which pair of elements would likely have similar valency and thus similar chemical behavior? A) nitrogen and phosphorus B) carbon and nitrogen C) sodium and chlorine D) hydrogen and helium 17) Which one of the atoms shown would be most likely to form a cation with a charge of +1? A) B) C) D) 18) A covalent chemical bond is one in which A) electrons are removed from one atom and transferred to another atom so that the two atoms become oppositely charged B) protons and neutrons are shared by two atoms so as to satisfy the requirements of both atoms C) outer-shell electrons of two atoms are shared so as to satisfactorily fill their respective orbitals D) outer-shell electrons of one atom are transferred to fill the inner electron shell of another atom 19) Elements found on the left side of the periodic table contain outer shells that are form , these elements tend to in solution. A) almost empty; cations B) almost empty; anions C) almost full; cations D) almost full; anions 20) What coefficients must be placed in the following blanks so that all atoms are accounted for in the products? C6H12O6 A) 2; 1 C2H60 + CO2 B) 3; 1 C) 1;3 D) 2; 2 21) Cohesion, surface tension, and adhesion are the properties of water molecules that B) increase when pH increases D) are a result of polar covalent bonding A) increase when temperature increases C) are a result of hydrogen bondingExplanation / Answer
15. b) helium (inert properties)
16. a) nitrogen and phosphorus ( valency 3 ; same no. of electrons in outer shell)
17. a) (because single electron present in outer shell)
18. c) outer shell electrons of two atoms are shared so as to satisfactorily fill their respective orbitals (sharing of electrons)
19. a) almost empty ; cations
20. d)2;2
21. c. are as a result of hydrogen bonding.