s Dehne periodic law or periodicity. ANSWER ON ATTACHED 19) What is the mass, in
ID: 560371 • Letter: S
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s Dehne periodic law or periodicity. ANSWER ON ATTACHED 19) What is the mass, in grams, of a single atom of the element that modern periodic table? YOU MUST SHOW YOUR WORK ON A is named for the founder of the PLACE ANSWER HERE 20-21) Write the hame and the symbol for the metalloid in the fifth period having six valence electrons 20) PLACE NAME HERE 21) PLACE SYMBOL HERE 22) How many elements are gasses at room temperature and pressure? PLACE ANSWER HERE 23) H ow many valence electrons are in an atom of the element found in the fourth period in group IVA? PLACE ANSWER HERE 24) The correct electron configuration for the element chlorine, whose atomic number is 17, is a. 1s22s22p5 25) After the 5s subshell of an atom is filled with electrons, the next electron added will enter the a. 4d subshell b. 5p subshell c. 5d subshell d. 6s subshell 26) What is the common name for the group of elements having only 1 valence electron? PLACE ANSWER HERE 27) In which area of the periodic table would an element be found whose electron configuration is c. p area d. f area a. s area 28) Which of the following classifications applies to an element whose electron configuration is c. transition metal eleme d. inner-transition meta a. noble gas element b. representative elementExplanation / Answer
18.)The Periodic Law states that the physical and chemical properties of the elements recur in a systematic and predictable way when the elements are arranged in order of increasing atomic number. This law states that the properties of the elements are periodic functions of their atomic numbers.
The properties of elements is the repetition of similar electronic configuration of their atoms in the outermost energy shell (or valence shell) after certain regular intervals is called periodicity.
19).
Mendelevium
Molar mass of Md = 258 g/mol.
Atomic mass =258 u = 4.2841904 × 10^-22 g ( 1 u =1.66054e-24)
22)
The elements that are gaseous at room temperature are -
H(hydrogen) , He(helium) , N(nitrogen) , O(oxygen) , F (fluorine), Ne(neon), Cl(chlorine) , (Ar)Argon , Kr ( Krypton) , Xe (xenon), Rn(Radon)
20 and. 21)
Name - Tellurium Symbol - Te
23) 4 valence electron are present in element of 4A group.
24).1s2 2s2 2p6 3s2 3p5 Option C is the correct electronic configuration of Cl.
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