Answer:
picture not bright
Explanation:
please a brainliest for tge feedback
The number of valence electrons of an element can be determined by the periodic table group (vertical column) in which the element is categorized
Answer:
-1160kj/mol
Explanation:
the reaction is exothermic because heat is released to the environment
The Selenium is the element that is likely to be the most brittle
The 28 is the sum of the protons and neutrons in the element silicon.
ALL silicon atoms have 14 protons in the nucleus, so we can turn this into an equation:
#protons + #neutrons = 28
14 + #neutrons = 28
#neutrons = 14
#protons = 14
