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kirill115 [55]
3 years ago
6

PLEASE HELP TIMED! Thank u guyssss

Chemistry
1 answer:
Lemur [1.5K]3 years ago
8 0

Answer:

#P: 15

#N: 16

Mass Number: 30.973762u (You can round it if you want)

Isotope symbol: P

Explanation:

I hope this helps :)

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Which element in period 3 has three times the electronegativity value compared to that of li in period 2
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Answer:

Nitrogen

Explanation:

Elements in period two includes lithium, beryllium, boron, carbon, nitrogen, oxygen, fluorine and neon.

According to periodic trends, the electro negativity values are expected to increase across the period up to fluorine. Hence, as we go right wards, we encounter elements with higher electronegative values.

While lithium has an electronegative value of 1 , the electronegative value of element nitrogen is thrrr times this which is equal to three

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To get the correct data

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Time that is measured in definite periods such as minutes, day,and years is called
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1. relative time

2.absolute time

Explanation:

Time that is measured in definite periods such as minutes, days, and years is called

a. Relative time.

b. absolute time.

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According to the following balanced chemical equation, if you want to produce eight moles of H2O, how many moles of CH4 do you n
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2 years ago
Lead (ll) nitride+ammonium sulfate > lead(ll) sulfate + ammonium nitride
Alenkinab [10]

Answer:

Pb_3N_2 + 3 (NH_4)_2SO_4\rightarrow 3 PbSO_4 + 2 (NH_4)_3N

Explanation:

Let's rewrite the given word equation in its chemical balanced equation representation:

1. Lead(II) nitride is represented by lead, Pb, in an oxidation state of 2+, while nitride is a typical nitrogen anion with a state 3-. As a result, the lowest common multiple between 2 and 3 is 6, meaning 2 lead cations are needed to balance 3 nitrogen anions: Pb_3N_2.

2. Ammonium sulfate consists of an ammonium cation with a 1+ charge and sulfate anion with a 2- charge, two ammonium cations needed: (NH_4)_2SO_4.

3. Lead(II) sulfate would have one lead cation and one sulfate anion, as they have the same magnitude of charges with opposite signs: PbSO_4.

4. Ammonium nitride would require three amonium cations to balance the nitride anion: (NH_4)_3N.

Let's write the balanced equation:

Pb_3N_2 + 3 (NH_4)_2SO_4\rightarrow 3 PbSO_4 + 2 (NH_4)_3N

7 0
4 years ago
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