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
Maslowich
3 years ago
11

A key bed is a layer of rock that looks similar to the layers around it.

Chemistry
1 answer:
MissTica3 years ago
4 0

The correct answer is False

You might be interested in
Dryers work with forced_____.<br><br>One word answer please ​
Zina [86]

Answer:

electricity

Explanation:

I'm not 100% sure though

7 0
3 years ago
Read 2 more answers
What is the empirical formula for a compound that has 57.5%
Rainbow [258]

Answer:

c

Explanation:

use %composition given to calculate emperical 4mular

8 0
3 years ago
Static electricity is produced when _____.
lbvjy [14]

Answer:

Atoms gain or lose electrons

Explanation:

6 0
2 years ago
Compounds put together will form -
Paraphin [41]
The correct answer is B. Compounds put together will form mixtures because compounds itself are pure substances which contains elements and atoms. Mixtures is a system that is made up of two or more substances or compounds which are not combined chemically.
4 0
3 years ago
How do you identify the group and period number of an element with example
11Alexandr11 [23.1K]

The period is equal to the number of shells present in an atom.

The group number is equal to the number of valence electrons.

<h3>What is the period in the periodic table?</h3>

A period in the periodic table is a row of chemical elements.

The horizontal rows (which Mendeleev called series) are called periods and the vertical columns, are groups.

Elements having similar outer electronic configurations in their atoms are arranged in vertical columns.

The period indicates the value of n for the outermost or valence shell. The period is equal to the number of shells present in an atom. To find a period, the no. of shells =no. of periods.

Example: Na- 2,8,1 - Three shells are there, so period no. is 3.

Calcium - 2,8,8,2 - Four shells are there, so period no. is 4.

To determine the group, we need to understand some rules:

1. If the element is in s block, then the group number is equal to the number of valence electrons.

Example: Mg(12) - 2,8,2

Group = no. of valence electrons = 2

2. If the element is in the p block, then the number of the group can be determined by the formula: (number of valence electrons + 10).for groups.

Example: S(16) - 2,8,6

Group = no. of valence electrons+ 10 = 6+ 10 = 16

3. If the element is in the d block, then the number of the group can be determined by the formula: number of electrons in(n−1)d subshell + (number of electrons in (n)s subshell).

Example: Fe(26):

[Ar]3d^64s^2

Group = number of electrons in(n−1)d subshell + (number of electrons in (n)s subshell) = 6+2 = 8

4. If the element is in the f block, then the number of the group is always 3.  Example: Cerium (58) belongs to the 3rd group.

Learn more about the period in the periodic table:

brainly.com/question/11965624

#SPJ1

6 0
2 years ago
Other questions:
  • Exactly one mole of an ideal gas is contained in a 2.00 liter container at 1,000 K. What is the pressure exerted by this gas?
    5·2 answers
  • Classify metals based on more reactive, moderate and less reactive​
    8·1 answer
  • witch can be classified as a trace fossil A. dinosur bone B. srimp burrow C. imprint on a fern leaf D. mold of a clam shell
    8·2 answers
  • Help lol sorry if I’m spamming this is just really hard for me
    12·2 answers
  • Calculate the mass of water produced when 7.26 g of butane reacts with excess oxygen
    13·1 answer
  • Which are functions of the stomata in the leaves of seed plants? Check all that apply.
    13·2 answers
  • Write BALANCED reactants &amp; products in words and symbols for 3
    5·1 answer
  • Write down the structural formula for the monomer from which
    14·2 answers
  • What is the resistance of a 20.0-m-long piece of 12-gauge copper wire having a 2.053-mm diameter?
    5·1 answer
  • what is meant by cathodic protection? a. steel is coated with a layer of paint b. iron in steel is oxidized to form a protective
    10·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!