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WorksheetsGroup I [Periodic Table]
Total questions: 14
Worksheet time: 28mins
What do you think of when you hear "Group I" elements?
Predict what will happen when rubidium is placed in water compared to caesium. (Refer to your Periodic Table!)
Rubidium will react less vigorously with water than caesium
Rubidium will react more vigorously with water than caesium
Their reactivity with water will be the same
What are the products formed when a Group I metal reacts with water?
Hydrogen gas and metal oxide
Hydrogen gas and metal hydroxide
Oxygen gas and metal oxide
Oxygen gas and metal hydroxide
Write a balanced equation with state symbols for the reaction between sodium and water
The atomic radius and the reactivity of Group I elements are given in the table below.
What do you observe about the relationship between the atomic radius and the reactivity of Group I elements?
The reactivity of a metal is determined by the ease of (how easy it is for) a metal atom in losing its valence electron(s) to form a positive ion (e.g. Na loses 1 valence electron to form Na+).
Down the group, the number of electron shells increases, causing electrons in the outer shell to become further away from the positive nucleus.
With reference to this information, why do you think the reactivity of Group I elements increases down the group?
(Hint: electrostatic forces of attraction exist between positively charged particles and negatively charged particles.)
Element X is a solid at room temperature. It needs to lose one electron per atom to gain the electronic structure of a noble gas. It has the lowest density and least reactivity with water in its group. What is element X?
At
Cs
Li
F
Which statement about alkali metals is correct?
Their reactivities decrease down the group
They form covalent bonds with the halogens
Their melting points decrease down the group
They form oxides on reacting with water
Which of the following are physical properties of Group I metals (choose all that apply)?
low density
low melting points
react with water to produce hydrogen gas and metal hydroxide
shiny, silvery metals
soft metals
Which of the following shows the balanced chemical equation for the reaction of potassium with water?
K + 2H2O → H2 + 2KOH
2K + H2O → O2 + 2KOH
2K + 2H2O → H2 + 2KOH
4K + 2H2O → H2 + 2K2OH
Which of the following shows an appropriate arrangement of Group I metals based on reactivity (from more reactive to less reactive)?
Na > Rb > Fr
Cs > K > Li
Rb > Cs > Na
Fr > Li > K
A new element, X, is found to be below caesium in Group I of the Periodic Table. Which of the following statements is incorrect about element X?
It is a soft solid.
It has a lower melting point than caesium.
It has one electron in its outermost shell.
It reacts less vigorously with water compared to caesium.
Which of the following is true down Group I (choose all that apply)?
The number of electron shells increases
The number of valence electrons increases
Proton number increases
Melting point increases
Reactivity increases
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