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In-s [12.5K]
4 years ago
14

Which two periods have the same number of elements ​

Chemistry
2 answers:
Stels [109]4 years ago
7 0

Answer:

4 & 5 have the same number of elements

Bogdan [553]4 years ago
6 0

Answer:

Periods 2 and 3 have the same number of elements.

Explanation:

I think periods  4 and 5 also have the same number of elements.

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Which element family is all 2-
Zielflug [23.3K]

Answer:

Alkaline Earth Metals

Explanation:

:)

4 0
4 years ago
Calculate the number of moles in 24.18 liters of neon gas at STP.
uranmaximum [27]

The number of moles of Neon gas : 1.079

<h3>Further explanation</h3>

Given

24.18 Liters of Neon gas at STP

Required

The number of moles

Solution

There are 2 conditions that are usually used as a reference in chemical calculations (mainly for determining the volume per mole of a gas or the molar volume), STP and RTP

Conditions at T 0 ° C and P 1 atm are stated by STP (Standard Temperature and Pressure). At STP, Vm is 22.4 liters / mol.

So mol for 24.18 L :

= 24.18 : 22.4

= 1.079 moles

8 0
3 years ago
What does the host mean when he says that the acid has "donated a proton" to the water?
weqwewe [10]

Answer:

Option B

Explanation:

As Brønsted-Lowry theory states, acids are the ones that can donate protons.

When a proton is donated, it is released to become medium more acidic.

HCl is a strong acid.

HCl (l) + H₂O (l)  →  H₃O⁺ (aq) +  Cl⁻(aq)

These always reffers to strong acid where the dissociation is 100% completed.

In a weak acid, dissociation is not 100% complete, that's why we have an equilibrium.

HA (l) + H₂O (l)  ⇄  H₃O⁺ (aq) +  A⁻(aq)                   Ka

5 0
3 years ago
Match each element to the number of electrons in its valence shell.
irinina [24]

Answer:

C: 4

H: 1

Mg: 2

O : 6

Explanation:

You can quickly find out the number of valence electrons by looking at where the element is on the periodic table and referring to the table that is attached.

6 0
1 year ago
Which item is the weakest acid on the chart?
serious [3.7K]
ANSWER: Milk

Explanation: Take this chart from 1-6 are acids from 8-14 those are bases
Now bases are like cleaning products and stuff
While acids are like lemons and other stuff
If you look at milk level which is 6.5 It is an acid but its A lot closer to neutral Than Other acids

3 0
3 years ago
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