diff --git a/1A_elements.txt b/1A_elements.txt
index 391de5e..b74280e 100644
--- a/1A_elements.txt
+++ b/1A_elements.txt
@@ -1 +1,4 @@
 H(1)
+Li(4)
+K(19)
+Na(11)
\ No newline at end of file