<span>These are two questions and two answers.
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<span>Question 1) The elements most likely to form more than one type of ion are the ______.
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<span>Answer: option A) transition metals.
</span><span>Jusitification:</span>
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1) The elements form ions by gaining or losing electrons. By gaining electrons, theY form anions (negative iones); by losing electrons, they form cations (positive ions).
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<span>2) The valence shell of the akaly metals is the type ns¹, which means that they have one electron in the valence shell. Then, they only can form one kind of ion which has the configuration of the previous noble gas (n-1)s²(n-1)p⁶ with 1+ charge.
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<span>3) The halogens have valence shell of the type ns²np⁵. That means that easily gain 1 electron to complete the valence shell ns²np₆ (the configuration of the next noble gas), with charge 1-. Gaining 5 electrons or losing more electrons than 1 is very disfavourable, so that is the only kind of ion they form.
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<span>4) The valence shells of alkaline earth metals are of the kind ns². So, the most favourable energetic ion is formed by losing 2 electrons and so taking the configuration of the previous noble gas, with charge 2+. That is the only type of ion they form.
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<span>5) Transition metals have electrons in the orbitals d, which are very similar in energy, and so they might loose 1, 2, or 3, electrons fo form ions with charges 1+, 2+, or 3+ respectively.
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<span>Question 2) The name iron(II) indicates that a compound contains _______.</span>
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A) iron ions with an II+ charge.
</span><span>B) iron ions with a 2+ charge.
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C) iron ions with a negative charge.
<span>D) two types of iron ions.
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Answer: option <span>B) iron ions with a 2+ charge.
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</span><span>The oxidation state may be indicated as Roman numerals, in this case II, or as a conventional number with its charge.
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</span><span>Iron, a transition metal, may loose 2 or 3 valence electrons. When it loses 2 electrons it forms an ion (cation) with positive charge 2. So, it is iron 2+</span>
Answer:
3 is oxygen and ozone and 4 is only methane.
Explanation:
Note, a compound consists of 2 or more elements.
The answer is c. decreases. The gas law has a rule of P1V1=P2V2. So when the pressure of this gas increases, the volume will decrease.
They are called inert gases, Nobel gases.
The common character in them all that they have a complete last electron shell. That they rarely tend to form any further chemical compounds.
<span>Particles in gas are best described as-hard spheres with insignificant volumes.
The atmospheric pressure below sea level is higher.</span>