give a symbol and a name for the following elements.
a) the 2$^{nd}$ period noble gas: symbol \
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b) the 4$^{th}$ period alkali metal: symbol \
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c) the 3$^{rd}$ period halogen: symbol \
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d) the last transition metal in the 6$^{th}$ period: symbol \
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e) the 4$^{th}$ period alkaline earth metal: symbol \
ule{1cm}{0.15mm} , name \
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Question

Accepted Answer

### Part (a)
# Explanation:
## Step1: Recall noble gases and periods
Noble gases are in group 18. The 2nd period (row) has elements from atomic number 3 (Li) to 10 (Ne). The noble gas in period 2 is Neon.
## Step2: Determine symbol and name
Symbol of Neon is Ne, name is Neon.
# Answer:
Symbol: Ne, Name: Neon

### Part (b)
# Explanation:
## Step1: Recall alkali metals and periods
Alkali metals are in group 1. The 4th period (row) has elements starting from atomic number 19 (K) to 36 (Kr). The alkali metal in period 4 is Potassium.
## Step2: Determine symbol and name
Symbol of Potassium is K, name is Potassium.
# Answer:
Symbol: K, Name: Potassium

### Part (c)
# Explanation:
## Step1: Recall halogens and periods
Halogens are in group 17. The 3rd period (row) has elements from atomic number 11 (Na) to 18 (Ar). The halogen in period 3 is Chlorine.
## Step2: Determine symbol and name
Symbol of Chlorine is Cl, name is Chlorine.
# Answer:
Symbol: Cl, Name: Chlorine

### Part (d)
# Explanation:
## Step1: Recall transition metals and 6th period
Transition metals are in d - block. The 6th period transition metals end at atomic number 112 (Copernicium) but considering common knowledge, the last transition metal in 6th period (d - block) is Mercury? Wait, no. Wait, the 6th period: transition metals are from group 3 - 12. The 6th period transition metals: the last one in d - block (before p - block) is Mercury? No, wait, the 6th period elements: atomic numbers 55 (Cs) to 86 (Rn). Transition metals in 6th period: from La (57) to Hg (80)? Wait, no, Hg is in group 12, 6th period. Wait, but the last transition metal in 6th period: the d - block ends at group 12. In 6th period, group 12 element is Mercury (Hg)? Wait, no, 6th period: Cs (55, group 1), Ba (56, group 2), La (57, group 3, lanthanide), then Hf (72) to Hg (80, group 12). Then Tl (81, group 13) etc. So the last transition metal (group 12) in 6th period is Mercury? Wait, no, Hg is atomic number 80. Wait, but some sources say the last transition metal in 6th period is Copernicium (Cn, 112) but that's in 7th period? Wait, no, 6th period is n = 6. Atomic number 55 - 86. So transition metals in 6th period: from La (57) to Hg (80, group 12). So the last transition metal (group 12) in 6th period is Mercury (Hg)? Wait, no, Hg is liquid. Wait, maybe I made a mistake. Wait, the 6th period: the d - block elements are from Hf (72) to Hg (80) (since La is lanthanide, f - block). So group 12, 6th period is Hg (mercury). But wait, the question says "last transition metal in the 6th period". Alternatively, maybe it's Gold? No, Au is group 11. Wait, Hg is group 12, 6th period. So symbol Hg, name Mercury. Wait, but let's check atomic numbers. 6th period: n = 6. The transition metals (d - block) in 6th period: Hf (72, group 4), Ta (73, group 5), W (74, group 6), Re (75, group 7), Os (76, group 8), Ir (77, group 9), Pt (78, group 10), Au (79, group 11), Hg (80, group 12). Then Tl (81, group 13, p - block). So the last transition metal (group 12) in 6th period is Hg (Mercury). So symbol Hg, name Mercury.
## Step2: Determine symbol and name
Symbol: Hg, Name: Mercury
# Answer:
Symbol: Hg, Name: Mercury

### Part (e)
# Explanation:
## Step1: Recall alkaline earth metals and periods
Alkaline earth metals are in group 2. The 4th period (row) has elements from atomic number 19 (K) to 36 (Kr). The alkaline earth metal in period 4 is Calcium.
## Step2: Determine symbol and name
Symbol of Calcium is Ca, name is Calcium.
# Answer:
Symbol: Ca, Name: Calcium

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QUESTION IMAGE

Question

Explanation:

Part (a)

Step1: Recall noble gases and periods

Step2: Determine symbol and name

Step1: Recall alkali metals and periods

Step2: Determine symbol and name

Step1: Recall halogens and periods

Step2: Determine symbol and name

Answer:

Part (b)