1- 2- 3- ... (1 mark) Part-l mgroup included in the periodic table? Give example

Question

1- 2- 3- ... (1 mark) Part-l mgroup included in the periodic table? Give example of non metal group? Q1-Define the following terms: 2)Element 2)Elemen 1)Mass number (I mark) 02-ls the ha ent or compound: ( mark) 4)Pb 5)Ca 6)KI 03-Identify the following as element or compound: DNO, 2, 3)CO 4)Pb 5)Ca for the correct temperatures fo 04. If the temperature equals 125.5 K, what are °C and from the options below: 1)-7.5 °C, 300.45 2)-48 °C,-54.4 233.5 3)-99.5 °C,-54.5 °F 4)-147.5"C, ·F (1 mark) Part-2 OS-What is the neutron number for these elements Mg", Zr, Ne, O* , Ru, Ag. One of these elements is located in noble group, which one and what is the electron number for these elements? 06-Is this sentence correct or not: (1 mark) (1 mark) (Metal element can loss electron, give example) Q7-Calculate the percentage of each element in (H,So,)? (1 mark) (1 mark) 09-How many moles of C,H,O are present in 5.077g ( mark) Q8-Define the following terms: choose two only IDMolecules 2)Orbital 3)Empirical formula

Explanation / Answer

Q1 )

1 ) mass number : the sum of protons and neutraons present in the nucleous are called mass number

2) element :  element is a species of atoms having the same number of protons in their atomic nuclei

Q2)

yes. halogen group included in the periodic table . non-metals F , Cl , Br , I

Q3 ) NO2-------------compound

I2 -------------> element

CO-------------compound

Pb ------------element

Ca--------------element

KI ------------compound

Q4)

answer : 4 ) -147.5 oC , -233.5 oF

T (K) = t + 273 ---------------> kelvin to oC

125.5 = t + 273

t = -174.5 oC

F -32 / 180 = C / 100------------> farenheat to oC

part 2)

Neutron numbers :

Mg+2 -------------12

Zr ---------------> 51

Ne -------------> 12

O-2 ------------> 8

Ag------------->60

Ru ------------>57

Ne is noble gas . electron number = 10

Q6 ) true . example : Fe--------------> Fe+2 + 2e-

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