1answer.
Ask question
Login Signup
Ask question
All categories
  • English
  • Mathematics
  • Social Studies
  • Business
  • History
  • Health
  • Geography
  • Biology
  • Physics
  • Chemistry
  • Computers and Technology
  • Arts
  • World Languages
  • Spanish
  • French
  • German
  • Advanced Placement (AP)
  • SAT
  • Medicine
  • Law
  • Engineering
slavikrds [6]
3 years ago
6

Elements are organized on the periodic table based on their properties. Which statement correctly predicts and explains the chem

ical reactivity of two metals?
a. Rubidium (Rb) is more reactive than strontium (Sr) because strontium atoms must lose more electrons.
b. Sodium (Na) is more reactive than magnesium (Mg) because sodium atoms must gain more electrons.
c. Calcium (Ca) is less reactive than potassium (K) because potassium atoms must lose more electrons.
d. Beryllium (Be) is less reactive than lithium (Li) because beryllium atoms must gain more electrons. 
Chemistry
2 answers:
Elanso [62]3 years ago
7 0

Answer is: a. Rubidium (Rb) is more reactive than strontium (Sr) because strontium atoms must lose more electrons.

The ionization energy (Ei) is the minimum amount of energy required to remove the valence electron, when element lose electrons, oxidation number of element grows (oxidation process).  

Alkaline metals (group 1), in this example rubidium, have lowest ionizations energy and easy remove valence electrons (one electron), they are most reactive metals.

Earth alkaline metals (group 2), in this example strontium, have higher ionization energy than alkaline metals, because they have two valence electrons, they are less reactive.  

Rubidium electron configuration: ₃₇Rb 1s²2s²2p⁶3s²3p⁶3d¹⁰4s²4p⁶5s¹; one valence electron is 5s¹ orbital.

Strontium electron configuration: ₃₈Sr 1s²2s²2p⁶3s²3p⁶3d¹⁰4s²4p⁶5s²; two valence electrons is 5s² orbital.

Norma-Jean [14]3 years ago
5 0

The correct statement about the reactivity of metal is option A, rubidium (Rb) is more reactive than strontium (Sr) because strontium atoms must lose more electrons.

Further explanation:

Reactivity is defined as the tendency of the element to lose or gain an electron.

The reactivity trend of metals in periodic table:

Across a period, the energy level remains same while the number of electrons increases. This causes an increase in nuclear charge of the atom. Therefore electrons are strongly held by the nuclear forces. As a result, the reactivity of metals decreases from left to right.

Down the groups, the energy level increases while the number of electrons remains same. This causes a decrease in nuclear charge of the atom. Therefore electrons are loosely held by the nuclear forces. As a result the reactivity of metals increases from top to bottom.

A. Rubidium (Rb) is more reactive than strontium (Sr) because on moving left to right in period reactivity of metal decreases. Also, in strontium electrons are more tightly held with nucleus, and it must lose more electron. This option is correct.

B. Sodium (Na) is more reactive than magnesium (Mg) because on moving left to right in period reactivity of metal decreases. Also, the magnesium atom has to lose more electron. So, the given reason for option B is wrong.

C. Calcium (Ca) is less reactive than potassium (K) because on moving left to right in period reactivity of metal decreases. Also, the calcium atom has to lose more electron. So, the given reason for option C is wrong.

D. Beryllium (Be) is less reactive than lithium (Li) because on moving left to right in period reactivity of metal decreases. Also, the beryllium atom has to lose more electron. So, the given reason for option D is wrong.

Learn more:

1. Determine the Lewis structure of butanal.: brainly.com/question/6215269

2. Determine the reason that causes water molecule a bent shape.:brainly.com/question/1979769

Answer details:

Grade: Senior school

Subject: Chemistry

Chapter: Periodic table

Keywords: Periodic table, reactivity, metal reactivity, rubidium, strontium, sodium, magnesium, calcium, potassium, beryllium, lithium, more reactive metal.

You might be interested in
Chemical formula for aluminum hydroxide is Al(OH)3 which of the following is true aluminum
frozen [14]
The answer to yo question is ( it has three OH groups). 
4 0
3 years ago
Based on table N of the reference tables what is the number of hours required for 42k (potassium -42) to undergo three half-life
skelet666 [1.2K]

The number of hours required : 37.2 hours

<h3>Further explanation</h3>

Given

⁴²K (potassium -42)

Required

The number of hours

Solution

The atomic nucleus can experience decay into 2 particles or more due to the instability of its atomic nucleus.  

Usually, radioactive elements have an unstable atomic nucleus.  

Based on Table N(attached), the half-life for ⁴²K is 12.4 hours, which means half of a sample of ⁴²K will decay in 12.4 hours

For three half-life periods :

\tt 3\times 12.4=37.2~hours

3 0
3 years ago
When carbon is burned in air, it reacts with oxygen to form carbon dioxide. When 16.8g of carbon were burned in the presence of
Mrrafil [7]
61.6 grams of carbon dioxide was produced
4 0
3 years ago
17)<br> How many grams are in 0.02 moles of beryllium iodide, Bel2?
Alinara [238K]

Answer:

beryllium iodide has a molar mass of 262.821 g mol−1 , which means that 1 mole of beryllium iodide has a mass of 262.821 g . To find the mass of 0.02 moles of beryllium iodide, simply multiply the number of moles by the molar mass in conversion factor form.

Explanation:

5 0
3 years ago
Read 2 more answers
After a covalent bond has stabilized an atom, the atom will have
Dafna1 [17]

<em>Answer:</em>

  • The atom have a full valence electron shell.

<em>Explanation:</em>

  • My question is that why covalent bonds take place?

Every atoms tends to from bond with another atoms in order to get nearest electronic configuration of nobel gases. They become stable when their valence shell become complete. So when covelant bond forms between atoms, share electrons to each other and stabilize themselves.

5 0
3 years ago
Read 2 more answers
Other questions:
  • Determine the frequency of radiation whose wavelength is 7.67 x 10^-7 cm. Then, determine the amount of energy in the radiation.
    8·1 answer
  • What is the volume of an object with the mass of 7.9 grams in the density of 1.28g/ml.
    15·1 answer
  • A student is investigating the affect of different salts on melting points. Four patches of ice of equal size are roped off and
    9·2 answers
  • A 0.89% (w/v) sodium chloride solution is referred to as physiological saline solution because it has the sameconcentration of s
    13·1 answer
  • Describe some of the dangers of Global warming.
    13·1 answer
  • Sodium will do an ionic bond with
    14·1 answer
  • Write the chemical formula of 25 compound​
    5·1 answer
  • Sodium bicarbonate =sodium carbonate + water + carbon dioxide gas
    5·1 answer
  • Help me pls!!<br> List all three sets of opposing forces.
    15·1 answer
  • Does the amount of mentos affect the height of the pop explosion
    11·2 answers
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!