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
umka2103 [35]
3 years ago
6

BRAINLIESTTTT ASAP!!! please explain your answers. :)

Biology
2 answers:
QveST [7]3 years ago
6 0
The two are potassium and rubidium. Why? Na is an alkali metal. As you go down the metals become more reactive. 
Calcium has 20 protons. Why? The atomic # is 20 (the one at the top).
It has 20 neutrons. Why? The atomic mass (the number on the bottom) is ~40, ignoring electron mass. 40- 20 protons = 20 neutrons. 
It has 20 electrons. 
Why? The # of protons and electrons is the same. Ions aren't on the periodic table.
Please mark brainliest if I helped you!
exis [7]3 years ago
4 0
Answer: POTASSIUM and RUBIDIUM 
Potassium and Rubidium are both Alkali Metals, as such is Sodium. They are alike in many ways, as is why they are categorized in the same group (Alkali Metals). <span>
The properties of Alkali Metals are as follows:
</span>they have low melting and boiling points compared to most other metals.they are very soft and can be cut easily with a knife.<span>they have low densities (lithium, sodium and potassium will float on water)
</span>
You might be interested in
has permitted rapid advances in our understanding of structural macromolecules from living cells. ________ has permitted rapid a
NemiM [27]

Answer:

Biogenesis

Explanation:

Biogenesis has permitted rapid advances in our understanding of structural macromolecules from living cells. Biogenesis theory was first coined by Rudolph Virchow and countered the claim of organisms being in existence according to the Big Bang Theory technique. Biogenesis involves the study of how organisms evolved from smaller ones to become complex.

Biokinetics deals with ways to maintain a healthy body through physical activities. Bio thermodynamics deals with the flow of energy in a biological system while Bioinformatics deals with the use of computer and technology in data analysis.

5 0
3 years ago
Plant and animal cells are eukaryotic cells because they have which organelle?
mylen [45]

Answer:

Eukaryotic cells, like plant and animal cells, have membrane-bound organelles like the <u>nucleus and mitochondria.</u>

Explanation:

3 0
2 years ago
Hurricanes are large storms than can span hundreds of miles across. These storms form over the ocean and can move to dry land ov
vichka [17]

Answer:

With satellites

Explanation:

4 0
3 years ago
Read 2 more answers
Why are most factors held constant in a scientific experiment
kotegsom [21]

A proposed explanation for a wide range of observations and experimental results that is supported by a wide range of evidence. ... Most factors are held constant in a scientific experiment because you can only change one factor in an experiment so if you notice something, you'll know what caused it.

3 0
3 years ago
if an organism occupies the secondary consumer trophic level in other food chains within a given food chain, is that organism al
nalin [4]

Answer:

The organisms that eat the primary consumers are called secondary consumers. Secondary consumers are generally meat-eaters—carnivores. The organisms that eat the secondary consumers are called tertiary consumers. These are carnivore-eating carnivores, like eagles or big fish.

Explanation:

7 0
3 years ago
Other questions:
  • In contrast to bioremediation, which is a strategy for _____, biological augmentation _____ a degraded ecosystem.
    9·1 answer
  • Predict: logging removes vegetation that anchors soil and prevents erosion. how do you think logging will affect a coral reef? e
    10·1 answer
  • What model organism did mendel use for determining the inheritance of traits?
    14·1 answer
  • Termites are insects that require the protozoan Trichonympha in their gut to synthesize the enzyme cellulase to degrade the cell
    13·1 answer
  • All BUT one of these occur during metaphase I of meiosis. Which of these would NOT occur during the metaphase I phase of meiosis
    10·2 answers
  • How are the neutral theory of molecular evolution and the molecular clock related?
    14·1 answer
  • Convert 6 x 10^8 out of scientific notation.
    9·2 answers
  • Help Science!
    6·2 answers
  • During DNA replication, DNA polymerase III can only add nucleotides in:
    8·1 answer
  • Which of the following answer choices best explains what process lead to each cells' unique structures
    8·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!