Question

Write the name and deduce the atomic number of the following element

i. The second alkali metal
ii. The fourth noble gas
iii. The third halogen
iv. The first transition element

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Answer 1

Heya❤

1 ) Rubidium, 37

2 ) Radon, 86

3 ) Cerium, 58

4 ) Manganese, 25

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Answer 2

Answer:

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i. The second alkali metal

sodium

the second alkali metal is sodium.

ii. The fourth noble gas

Y

Noble gases are the elements of the zero group. These are the inert element. 

Their octet is complete. hence, they have a stable electronic configuration. 

∴ The noble gas of period in the 4th period is Y.

iii. The third halogen

Chlorine

Chlorine is a halogen in group 17 and period 3. It is very reactive and is widely used for many purposes, such as as a disinfectant. Due to its high reactivity, it is commonly found in nature bonded to many different elements.

iv. The first transition element

scandium

The first main transition series begins with either scandium (symbol Sc, atomic number 21) or titanium (symbol Ti, atomic number 22) and ends with zinc (symbol Zn, atomic number 30). The second series includes the elements yttrium (symbol Y, atomic number 39) to cadmium (symbol Cd, atomic number 48).